src/HOL/HOL.thy
author haftmann
Thu, 13 Nov 2008 15:58:38 +0100
changeset 28741 1b257449f804
parent 28699 32b6a8f12c1c
child 28856 5e009a80fe6d
permissions -rw-r--r--
simproc for let
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(*  Title:      HOL/HOL.thy
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    ID:         $Id$
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    Author:     Tobias Nipkow, Markus Wenzel, and Larry Paulson
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*)
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header {* The basis of Higher-Order Logic *}
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theory HOL
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imports Pure
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uses
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  ("hologic.ML")
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  "~~/src/Tools/IsaPlanner/zipper.ML"
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  "~~/src/Tools/IsaPlanner/isand.ML"
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  "~~/src/Tools/IsaPlanner/rw_tools.ML"
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  "~~/src/Tools/IsaPlanner/rw_inst.ML"
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  "~~/src/Provers/project_rule.ML"
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  "~~/src/Provers/hypsubst.ML"
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  "~~/src/Provers/splitter.ML"
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  "~~/src/Provers/classical.ML"
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  "~~/src/Provers/blast.ML"
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  "~~/src/Provers/clasimp.ML"
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  "~~/src/Provers/coherent.ML"
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  "~~/src/Provers/eqsubst.ML"
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  "~~/src/Provers/quantifier1.ML"
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  ("simpdata.ML")
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  "~~/src/Tools/random_word.ML"
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  "~~/src/Tools/atomize_elim.ML"
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  "~~/src/Tools/induct.ML"
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  ("~~/src/Tools/induct_tacs.ML")
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  "~~/src/Tools/code/code_name.ML"
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  "~~/src/Tools/code/code_funcgr.ML"
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  "~~/src/Tools/code/code_thingol.ML"
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  "~~/src/Tools/code/code_printer.ML"
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  "~~/src/Tools/code/code_target.ML"
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  "~~/src/Tools/code/code_ml.ML"
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  "~~/src/Tools/code/code_haskell.ML"
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  "~~/src/Tools/nbe.ML"
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  ("~~/src/HOL/Tools/recfun_codegen.ML")
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begin
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subsection {* Primitive logic *}
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subsubsection {* Core syntax *}
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classes type
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defaultsort type
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setup {* ObjectLogic.add_base_sort @{sort type} *}
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arities
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  "fun" :: (type, type) type
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  itself :: (type) type
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global
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typedecl bool
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judgment
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  Trueprop      :: "bool => prop"                   ("(_)" 5)
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consts
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  Not           :: "bool => bool"                   ("~ _" [40] 40)
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  True          :: bool
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  False         :: bool
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  The           :: "('a => bool) => 'a"
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  All           :: "('a => bool) => bool"           (binder "ALL " 10)
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  Ex            :: "('a => bool) => bool"           (binder "EX " 10)
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  Ex1           :: "('a => bool) => bool"           (binder "EX! " 10)
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  Let           :: "['a, 'a => 'b] => 'b"
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  "op ="        :: "['a, 'a] => bool"               (infixl "=" 50)
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  "op &"        :: "[bool, bool] => bool"           (infixr "&" 35)
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  "op |"        :: "[bool, bool] => bool"           (infixr "|" 30)
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  "op -->"      :: "[bool, bool] => bool"           (infixr "-->" 25)
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local
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consts
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  If            :: "[bool, 'a, 'a] => 'a"           ("(if (_)/ then (_)/ else (_))" 10)
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subsubsection {* Additional concrete syntax *}
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notation (output)
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  "op ="  (infix "=" 50)
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abbreviation
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  not_equal :: "['a, 'a] => bool"  (infixl "~=" 50) where
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  "x ~= y == ~ (x = y)"
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notation (output)
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  not_equal  (infix "~=" 50)
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notation (xsymbols)
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  Not  ("\<not> _" [40] 40) and
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  "op &"  (infixr "\<and>" 35) and
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  "op |"  (infixr "\<or>" 30) and
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  "op -->"  (infixr "\<longrightarrow>" 25) and
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  not_equal  (infix "\<noteq>" 50)
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notation (HTML output)
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  Not  ("\<not> _" [40] 40) and
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  "op &"  (infixr "\<and>" 35) and
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  "op |"  (infixr "\<or>" 30) and
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  not_equal  (infix "\<noteq>" 50)
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abbreviation (iff)
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  iff :: "[bool, bool] => bool"  (infixr "<->" 25) where
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  "A <-> B == A = B"
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notation (xsymbols)
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  iff  (infixr "\<longleftrightarrow>" 25)
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nonterminals
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  letbinds  letbind
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  case_syn  cases_syn
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syntax
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  "_The"        :: "[pttrn, bool] => 'a"                 ("(3THE _./ _)" [0, 10] 10)
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  "_bind"       :: "[pttrn, 'a] => letbind"              ("(2_ =/ _)" 10)
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  ""            :: "letbind => letbinds"                 ("_")
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  "_binds"      :: "[letbind, letbinds] => letbinds"     ("_;/ _")
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  "_Let"        :: "[letbinds, 'a] => 'a"                ("(let (_)/ in (_))" 10)
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  "_case_syntax":: "['a, cases_syn] => 'b"               ("(case _ of/ _)" 10)
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  "_case1"      :: "['a, 'b] => case_syn"                ("(2_ =>/ _)" 10)
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  ""            :: "case_syn => cases_syn"               ("_")
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  "_case2"      :: "[case_syn, cases_syn] => cases_syn"  ("_/ | _")
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translations
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  "THE x. P"              == "The (%x. P)"
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  "_Let (_binds b bs) e"  == "_Let b (_Let bs e)"
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  "let x = a in e"        == "Let a (%x. e)"
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print_translation {*
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(* To avoid eta-contraction of body: *)
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[("The", fn [Abs abs] =>
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     let val (x,t) = atomic_abs_tr' abs
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     in Syntax.const "_The" $ x $ t end)]
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*}
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syntax (xsymbols)
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  "_case1"      :: "['a, 'b] => case_syn"                ("(2_ \<Rightarrow>/ _)" 10)
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notation (xsymbols)
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  All  (binder "\<forall>" 10) and
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  Ex  (binder "\<exists>" 10) and
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  Ex1  (binder "\<exists>!" 10)
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notation (HTML output)
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  All  (binder "\<forall>" 10) and
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  Ex  (binder "\<exists>" 10) and
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  Ex1  (binder "\<exists>!" 10)
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notation (HOL)
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  All  (binder "! " 10) and
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  Ex  (binder "? " 10) and
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  Ex1  (binder "?! " 10)
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subsubsection {* Axioms and basic definitions *}
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axioms
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  refl:           "t = (t::'a)"
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  subst:          "s = t \<Longrightarrow> P s \<Longrightarrow> P t"
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  ext:            "(!!x::'a. (f x ::'b) = g x) ==> (%x. f x) = (%x. g x)"
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    -- {*Extensionality is built into the meta-logic, and this rule expresses
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         a related property.  It is an eta-expanded version of the traditional
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         rule, and similar to the ABS rule of HOL*}
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  the_eq_trivial: "(THE x. x = a) = (a::'a)"
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  impI:           "(P ==> Q) ==> P-->Q"
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  mp:             "[| P-->Q;  P |] ==> Q"
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defs
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  True_def:     "True      == ((%x::bool. x) = (%x. x))"
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  All_def:      "All(P)    == (P = (%x. True))"
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  Ex_def:       "Ex(P)     == !Q. (!x. P x --> Q) --> Q"
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  False_def:    "False     == (!P. P)"
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  not_def:      "~ P       == P-->False"
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  and_def:      "P & Q     == !R. (P-->Q-->R) --> R"
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  or_def:       "P | Q     == !R. (P-->R) --> (Q-->R) --> R"
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  Ex1_def:      "Ex1(P)    == ? x. P(x) & (! y. P(y) --> y=x)"
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axioms
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  iff:          "(P-->Q) --> (Q-->P) --> (P=Q)"
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  True_or_False:  "(P=True) | (P=False)"
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defs
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  Let_def:      "Let s f == f(s)"
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  if_def:       "If P x y == THE z::'a. (P=True --> z=x) & (P=False --> z=y)"
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finalconsts
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  "op ="
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  "op -->"
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  The
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axiomatization
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  undefined :: 'a
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abbreviation (input)
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  "arbitrary \<equiv> undefined"
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subsubsection {* Generic classes and algebraic operations *}
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class default = type +
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  fixes default :: 'a
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class zero = type + 
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  fixes zero :: 'a  ("0")
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class one = type +
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  fixes one  :: 'a  ("1")
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hide (open) const zero one
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class plus = type +
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  fixes plus :: "'a \<Rightarrow> 'a \<Rightarrow> 'a"  (infixl "+" 65)
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class minus = type +
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  fixes minus :: "'a \<Rightarrow> 'a \<Rightarrow> 'a"  (infixl "-" 65)
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class uminus = type +
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  fixes uminus :: "'a \<Rightarrow> 'a"  ("- _" [81] 80)
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class times = type +
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  fixes times :: "'a \<Rightarrow> 'a \<Rightarrow> 'a"  (infixl "*" 70)
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class inverse = type +
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  fixes inverse :: "'a \<Rightarrow> 'a"
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    and divide :: "'a \<Rightarrow> 'a \<Rightarrow> 'a"  (infixl "'/" 70)
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class abs = type +
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  fixes abs :: "'a \<Rightarrow> 'a"
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begin
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notation (xsymbols)
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  abs  ("\<bar>_\<bar>")
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notation (HTML output)
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  abs  ("\<bar>_\<bar>")
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end
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class sgn = type +
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  fixes sgn :: "'a \<Rightarrow> 'a"
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class ord = type +
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  fixes less_eq :: "'a \<Rightarrow> 'a \<Rightarrow> bool"
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    and less :: "'a \<Rightarrow> 'a \<Rightarrow> bool"
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begin
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notation
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  less_eq  ("op <=") and
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  less_eq  ("(_/ <= _)" [51, 51] 50) and
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  less  ("op <") and
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  less  ("(_/ < _)"  [51, 51] 50)
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notation (xsymbols)
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  less_eq  ("op \<le>") and
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  less_eq  ("(_/ \<le> _)"  [51, 51] 50)
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notation (HTML output)
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  less_eq  ("op \<le>") and
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  less_eq  ("(_/ \<le> _)"  [51, 51] 50)
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abbreviation (input)
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  greater_eq  (infix ">=" 50) where
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  "x >= y \<equiv> y <= x"
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notation (input)
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  greater_eq  (infix "\<ge>" 50)
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abbreviation (input)
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  greater  (infix ">" 50) where
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  "x > y \<equiv> y < x"
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end
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syntax
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  "_index1"  :: index    ("\<^sub>1")
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translations
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  (index) "\<^sub>1" => (index) "\<^bsub>\<struct>\<^esub>"
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typed_print_translation {*
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let
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  fun tr' c = (c, fn show_sorts => fn T => fn ts =>
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    if T = dummyT orelse not (! show_types) andalso can Term.dest_Type T then raise Match
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    else Syntax.const Syntax.constrainC $ Syntax.const c $ Syntax.term_of_typ show_sorts T);
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in map tr' [@{const_syntax HOL.one}, @{const_syntax HOL.zero}] end;
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*} -- {* show types that are presumably too general *}
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subsection {* Fundamental rules *}
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subsubsection {* Equality *}
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lemma sym: "s = t ==> t = s"
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  by (erule subst) (rule refl)
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lemma ssubst: "t = s ==> P s ==> P t"
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  by (drule sym) (erule subst)
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lemma trans: "[| r=s; s=t |] ==> r=t"
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  by (erule subst)
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lemma meta_eq_to_obj_eq: 
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  assumes meq: "A == B"
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  shows "A = B"
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  by (unfold meq) (rule refl)
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text {* Useful with @{text erule} for proving equalities from known equalities. *}
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     (* a = b
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        |   |
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        c = d   *)
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lemma box_equals: "[| a=b;  a=c;  b=d |] ==> c=d"
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apply (rule trans)
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   323
apply (rule trans)
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apply (rule sym)
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apply assumption+
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   326
done
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text {* For calculational reasoning: *}
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   329
2ef571f80a55 Moved oderings from HOL into the new Orderings.thy
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   330
lemma forw_subst: "a = b ==> P b ==> P a"
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  by (rule ssubst)
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2ef571f80a55 Moved oderings from HOL into the new Orderings.thy
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lemma back_subst: "P a ==> a = b ==> P b"
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  by (rule subst)
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   335
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   336
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   337
subsubsection {*Congruence rules for application*}
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(*similar to AP_THM in Gordon's HOL*)
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   340
lemma fun_cong: "(f::'a=>'b) = g ==> f(x)=g(x)"
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   341
apply (erule subst)
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   342
apply (rule refl)
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   343
done
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   344
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   345
(*similar to AP_TERM in Gordon's HOL and FOL's subst_context*)
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   346
lemma arg_cong: "x=y ==> f(x)=f(y)"
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   347
apply (erule subst)
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   348
apply (rule refl)
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   349
done
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   350
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   351
lemma arg_cong2: "\<lbrakk> a = b; c = d \<rbrakk> \<Longrightarrow> f a c = f b d"
157f3988f775 arg_cong2 by Norbert Voelker
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   352
apply (erule ssubst)+
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   353
apply (rule refl)
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   354
done
157f3988f775 arg_cong2 by Norbert Voelker
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   355
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   356
lemma cong: "[| f = g; (x::'a) = y |] ==> f(x) = g(y)"
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   357
apply (erule subst)+
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   358
apply (rule refl)
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   359
done
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   360
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   361
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   362
subsubsection {*Equality of booleans -- iff*}
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   363
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   364
lemma iffI: assumes "P ==> Q" and "Q ==> P" shows "P=Q"
9c97af4a1567 tuned proofs;
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   365
  by (iprover intro: iff [THEN mp, THEN mp] impI assms)
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   366
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   367
lemma iffD2: "[| P=Q; Q |] ==> P"
18457
356a9f711899 structure ProjectRule;
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   368
  by (erule ssubst)
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   369
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   370
lemma rev_iffD2: "[| Q; P=Q |] ==> P"
18457
356a9f711899 structure ProjectRule;
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   371
  by (erule iffD2)
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   372
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   373
lemma iffD1: "Q = P \<Longrightarrow> Q \<Longrightarrow> P"
9c97af4a1567 tuned proofs;
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  by (drule sym) (rule iffD2)
9c97af4a1567 tuned proofs;
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   375
9c97af4a1567 tuned proofs;
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   376
lemma rev_iffD1: "Q \<Longrightarrow> Q = P \<Longrightarrow> P"
9c97af4a1567 tuned proofs;
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   377
  by (drule sym) (rule rev_iffD2)
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   378
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   379
lemma iffE:
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   380
  assumes major: "P=Q"
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   381
    and minor: "[| P --> Q; Q --> P |] ==> R"
18457
356a9f711899 structure ProjectRule;
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   382
  shows R
356a9f711899 structure ProjectRule;
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parents: 17992
diff changeset
   383
  by (iprover intro: minor impI major [THEN iffD2] major [THEN iffD1])
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   384
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   385
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   386
subsubsection {*True*}
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   387
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   388
lemma TrueI: "True"
21504
9c97af4a1567 tuned proofs;
wenzelm
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   389
  unfolding True_def by (rule refl)
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   390
21504
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   391
lemma eqTrueI: "P ==> P = True"
18457
356a9f711899 structure ProjectRule;
wenzelm
parents: 17992
diff changeset
   392
  by (iprover intro: iffI TrueI)
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   393
21504
9c97af4a1567 tuned proofs;
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   394
lemma eqTrueE: "P = True ==> P"
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   395
  by (erule iffD2) (rule TrueI)
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   396
1d195de59497 removal of HOL_Lemmas
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diff changeset
   397
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   398
subsubsection {*Universal quantifier*}
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diff changeset
   399
21504
9c97af4a1567 tuned proofs;
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   400
lemma allI: assumes "!!x::'a. P(x)" shows "ALL x. P(x)"
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   401
  unfolding All_def by (iprover intro: ext eqTrueI assms)
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diff changeset
   402
1d195de59497 removal of HOL_Lemmas
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diff changeset
   403
lemma spec: "ALL x::'a. P(x) ==> P(x)"
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diff changeset
   404
apply (unfold All_def)
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diff changeset
   405
apply (rule eqTrueE)
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   406
apply (erule fun_cong)
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diff changeset
   407
done
1d195de59497 removal of HOL_Lemmas
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diff changeset
   408
1d195de59497 removal of HOL_Lemmas
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diff changeset
   409
lemma allE:
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   410
  assumes major: "ALL x. P(x)"
21504
9c97af4a1567 tuned proofs;
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parents: 21502
diff changeset
   411
    and minor: "P(x) ==> R"
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   412
  shows R
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   413
  by (iprover intro: minor major [THEN spec])
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diff changeset
   414
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diff changeset
   415
lemma all_dupE:
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   416
  assumes major: "ALL x. P(x)"
21504
9c97af4a1567 tuned proofs;
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parents: 21502
diff changeset
   417
    and minor: "[| P(x); ALL x. P(x) |] ==> R"
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   418
  shows R
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   419
  by (iprover intro: minor major major [THEN spec])
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diff changeset
   420
1d195de59497 removal of HOL_Lemmas
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diff changeset
   421
21504
9c97af4a1567 tuned proofs;
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   422
subsubsection {* False *}
9c97af4a1567 tuned proofs;
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diff changeset
   423
9c97af4a1567 tuned proofs;
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diff changeset
   424
text {*
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   425
  Depends upon @{text spec}; it is impossible to do propositional
9c97af4a1567 tuned proofs;
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parents: 21502
diff changeset
   426
  logic before quantifiers!
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   427
*}
15411
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diff changeset
   428
1d195de59497 removal of HOL_Lemmas
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diff changeset
   429
lemma FalseE: "False ==> P"
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   430
  apply (unfold False_def)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   431
  apply (erule spec)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   432
  done
15411
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paulson
parents: 15380
diff changeset
   433
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   434
lemma False_neq_True: "False = True ==> P"
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   435
  by (erule eqTrueE [THEN FalseE])
15411
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paulson
parents: 15380
diff changeset
   436
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   437
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   438
subsubsection {* Negation *}
15411
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diff changeset
   439
1d195de59497 removal of HOL_Lemmas
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diff changeset
   440
lemma notI:
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   441
  assumes "P ==> False"
15411
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paulson
parents: 15380
diff changeset
   442
  shows "~P"
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   443
  apply (unfold not_def)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   444
  apply (iprover intro: impI assms)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   445
  done
15411
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paulson
parents: 15380
diff changeset
   446
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   447
lemma False_not_True: "False ~= True"
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   448
  apply (rule notI)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   449
  apply (erule False_neq_True)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   450
  done
15411
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paulson
parents: 15380
diff changeset
   451
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   452
lemma True_not_False: "True ~= False"
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   453
  apply (rule notI)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   454
  apply (drule sym)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   455
  apply (erule False_neq_True)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   456
  done
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   457
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   458
lemma notE: "[| ~P;  P |] ==> R"
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   459
  apply (unfold not_def)
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   460
  apply (erule mp [THEN FalseE])
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   461
  apply assumption
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   462
  done
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   463
21504
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   464
lemma notI2: "(P \<Longrightarrow> \<not> Pa) \<Longrightarrow> (P \<Longrightarrow> Pa) \<Longrightarrow> \<not> P"
9c97af4a1567 tuned proofs;
wenzelm
parents: 21502
diff changeset
   465
  by (erule notE [THEN notI]) (erule meta_mp)
15411
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paulson
parents: 15380
diff changeset
   466
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   467
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   468
subsubsection {*Implication*}
15411
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paulson
parents: 15380
diff changeset
   469
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   470
lemma impE:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   471
  assumes "P-->Q" "P" "Q ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   472
  shows "R"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   473
by (iprover intro: assms mp)
15411
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paulson
parents: 15380
diff changeset
   474
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   475
(* Reduces Q to P-->Q, allowing substitution in P. *)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   476
lemma rev_mp: "[| P;  P --> Q |] ==> Q"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   477
by (iprover intro: mp)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   478
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   479
lemma contrapos_nn:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   480
  assumes major: "~Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   481
      and minor: "P==>Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   482
  shows "~P"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   483
by (iprover intro: notI minor major [THEN notE])
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   484
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   485
(*not used at all, but we already have the other 3 combinations *)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   486
lemma contrapos_pn:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   487
  assumes major: "Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   488
      and minor: "P ==> ~Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   489
  shows "~P"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   490
by (iprover intro: notI minor major notE)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   491
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   492
lemma not_sym: "t ~= s ==> s ~= t"
21250
a268f6288fb6 moved lemma eq_neq_eq_imp_neq to HOL
haftmann
parents: 21218
diff changeset
   493
  by (erule contrapos_nn) (erule sym)
a268f6288fb6 moved lemma eq_neq_eq_imp_neq to HOL
haftmann
parents: 21218
diff changeset
   494
a268f6288fb6 moved lemma eq_neq_eq_imp_neq to HOL
haftmann
parents: 21218
diff changeset
   495
lemma eq_neq_eq_imp_neq: "[| x = a ; a ~= b; b = y |] ==> x ~= y"
a268f6288fb6 moved lemma eq_neq_eq_imp_neq to HOL
haftmann
parents: 21218
diff changeset
   496
  by (erule subst, erule ssubst, assumption)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   497
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   498
(*still used in HOLCF*)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   499
lemma rev_contrapos:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   500
  assumes pq: "P ==> Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   501
      and nq: "~Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   502
  shows "~P"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   503
apply (rule nq [THEN contrapos_nn])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   504
apply (erule pq)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   505
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   506
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   507
subsubsection {*Existential quantifier*}
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   508
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   509
lemma exI: "P x ==> EX x::'a. P x"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   510
apply (unfold Ex_def)
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   511
apply (iprover intro: allI allE impI mp)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   512
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   513
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   514
lemma exE:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   515
  assumes major: "EX x::'a. P(x)"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   516
      and minor: "!!x. P(x) ==> Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   517
  shows "Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   518
apply (rule major [unfolded Ex_def, THEN spec, THEN mp])
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   519
apply (iprover intro: impI [THEN allI] minor)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   520
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   521
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   522
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   523
subsubsection {*Conjunction*}
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   524
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   525
lemma conjI: "[| P; Q |] ==> P&Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   526
apply (unfold and_def)
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   527
apply (iprover intro: impI [THEN allI] mp)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   528
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   529
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   530
lemma conjunct1: "[| P & Q |] ==> P"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   531
apply (unfold and_def)
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   532
apply (iprover intro: impI dest: spec mp)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   533
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   534
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   535
lemma conjunct2: "[| P & Q |] ==> Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   536
apply (unfold and_def)
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   537
apply (iprover intro: impI dest: spec mp)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   538
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   539
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   540
lemma conjE:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   541
  assumes major: "P&Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   542
      and minor: "[| P; Q |] ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   543
  shows "R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   544
apply (rule minor)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   545
apply (rule major [THEN conjunct1])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   546
apply (rule major [THEN conjunct2])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   547
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   548
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   549
lemma context_conjI:
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   550
  assumes "P" "P ==> Q" shows "P & Q"
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   551
by (iprover intro: conjI assms)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   552
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   553
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   554
subsubsection {*Disjunction*}
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   555
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   556
lemma disjI1: "P ==> P|Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   557
apply (unfold or_def)
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   558
apply (iprover intro: allI impI mp)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   559
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   560
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   561
lemma disjI2: "Q ==> P|Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   562
apply (unfold or_def)
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   563
apply (iprover intro: allI impI mp)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   564
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   565
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   566
lemma disjE:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   567
  assumes major: "P|Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   568
      and minorP: "P ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   569
      and minorQ: "Q ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   570
  shows "R"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   571
by (iprover intro: minorP minorQ impI
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   572
                 major [unfolded or_def, THEN spec, THEN mp, THEN mp])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   573
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   574
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   575
subsubsection {*Classical logic*}
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   576
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   577
lemma classical:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   578
  assumes prem: "~P ==> P"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   579
  shows "P"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   580
apply (rule True_or_False [THEN disjE, THEN eqTrueE])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   581
apply assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   582
apply (rule notI [THEN prem, THEN eqTrueI])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   583
apply (erule subst)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   584
apply assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   585
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   586
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   587
lemmas ccontr = FalseE [THEN classical, standard]
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   588
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   589
(*notE with premises exchanged; it discharges ~R so that it can be used to
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   590
  make elimination rules*)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   591
lemma rev_notE:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   592
  assumes premp: "P"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   593
      and premnot: "~R ==> ~P"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   594
  shows "R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   595
apply (rule ccontr)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   596
apply (erule notE [OF premnot premp])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   597
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   598
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   599
(*Double negation law*)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   600
lemma notnotD: "~~P ==> P"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   601
apply (rule classical)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   602
apply (erule notE)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   603
apply assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   604
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   605
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   606
lemma contrapos_pp:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   607
  assumes p1: "Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   608
      and p2: "~P ==> ~Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   609
  shows "P"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   610
by (iprover intro: classical p1 p2 notE)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   611
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   612
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   613
subsubsection {*Unique existence*}
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   614
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   615
lemma ex1I:
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   616
  assumes "P a" "!!x. P(x) ==> x=a"
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   617
  shows "EX! x. P(x)"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   618
by (unfold Ex1_def, iprover intro: assms exI conjI allI impI)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   619
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   620
text{*Sometimes easier to use: the premises have no shared variables.  Safe!*}
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   621
lemma ex_ex1I:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   622
  assumes ex_prem: "EX x. P(x)"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   623
      and eq: "!!x y. [| P(x); P(y) |] ==> x=y"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   624
  shows "EX! x. P(x)"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   625
by (iprover intro: ex_prem [THEN exE] ex1I eq)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   626
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   627
lemma ex1E:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   628
  assumes major: "EX! x. P(x)"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   629
      and minor: "!!x. [| P(x);  ALL y. P(y) --> y=x |] ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   630
  shows "R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   631
apply (rule major [unfolded Ex1_def, THEN exE])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   632
apply (erule conjE)
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   633
apply (iprover intro: minor)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   634
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   635
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   636
lemma ex1_implies_ex: "EX! x. P x ==> EX x. P x"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   637
apply (erule ex1E)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   638
apply (rule exI)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   639
apply assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   640
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   641
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   642
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   643
subsubsection {*THE: definite description operator*}
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   644
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   645
lemma the_equality:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   646
  assumes prema: "P a"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   647
      and premx: "!!x. P x ==> x=a"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   648
  shows "(THE x. P x) = a"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   649
apply (rule trans [OF _ the_eq_trivial])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   650
apply (rule_tac f = "The" in arg_cong)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   651
apply (rule ext)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   652
apply (rule iffI)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   653
 apply (erule premx)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   654
apply (erule ssubst, rule prema)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   655
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   656
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   657
lemma theI:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   658
  assumes "P a" and "!!x. P x ==> x=a"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   659
  shows "P (THE x. P x)"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   660
by (iprover intro: assms the_equality [THEN ssubst])
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   661
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   662
lemma theI': "EX! x. P x ==> P (THE x. P x)"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   663
apply (erule ex1E)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   664
apply (erule theI)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   665
apply (erule allE)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   666
apply (erule mp)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   667
apply assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   668
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   669
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   670
(*Easier to apply than theI: only one occurrence of P*)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   671
lemma theI2:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   672
  assumes "P a" "!!x. P x ==> x=a" "!!x. P x ==> Q x"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   673
  shows "Q (THE x. P x)"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   674
by (iprover intro: assms theI)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   675
24553
9b19da7b2b08 added lemma
nipkow
parents: 24506
diff changeset
   676
lemma the1I2: assumes "EX! x. P x" "\<And>x. P x \<Longrightarrow> Q x" shows "Q (THE x. P x)"
9b19da7b2b08 added lemma
nipkow
parents: 24506
diff changeset
   677
by(iprover intro:assms(2) theI2[where P=P and Q=Q] ex1E[OF assms(1)]
9b19da7b2b08 added lemma
nipkow
parents: 24506
diff changeset
   678
           elim:allE impE)
9b19da7b2b08 added lemma
nipkow
parents: 24506
diff changeset
   679
18697
86b3f73e3fd5 declare the1_equality [elim?];
wenzelm
parents: 18689
diff changeset
   680
lemma the1_equality [elim?]: "[| EX!x. P x; P a |] ==> (THE x. P x) = a"
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   681
apply (rule the_equality)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   682
apply  assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   683
apply (erule ex1E)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   684
apply (erule all_dupE)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   685
apply (drule mp)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   686
apply  assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   687
apply (erule ssubst)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   688
apply (erule allE)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   689
apply (erule mp)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   690
apply assumption
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   691
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   692
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   693
lemma the_sym_eq_trivial: "(THE y. x=y) = x"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   694
apply (rule the_equality)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   695
apply (rule refl)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   696
apply (erule sym)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   697
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   698
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   699
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   700
subsubsection {*Classical intro rules for disjunction and existential quantifiers*}
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   701
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   702
lemma disjCI:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   703
  assumes "~Q ==> P" shows "P|Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   704
apply (rule classical)
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   705
apply (iprover intro: assms disjI1 disjI2 notI elim: notE)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   706
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   707
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   708
lemma excluded_middle: "~P | P"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   709
by (iprover intro: disjCI)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   710
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   711
text {*
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   712
  case distinction as a natural deduction rule.
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   713
  Note that @{term "~P"} is the second case, not the first
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   714
*}
27126
3ede9103de8e eliminated obsolete case_split_thm -- use case_split;
wenzelm
parents: 27107
diff changeset
   715
lemma case_split [case_names True False]:
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   716
  assumes prem1: "P ==> Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   717
      and prem2: "~P ==> Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   718
  shows "Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   719
apply (rule excluded_middle [THEN disjE])
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   720
apply (erule prem2)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   721
apply (erule prem1)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   722
done
27126
3ede9103de8e eliminated obsolete case_split_thm -- use case_split;
wenzelm
parents: 27107
diff changeset
   723
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   724
(*Classical implies (-->) elimination. *)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   725
lemma impCE:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   726
  assumes major: "P-->Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   727
      and minor: "~P ==> R" "Q ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   728
  shows "R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   729
apply (rule excluded_middle [of P, THEN disjE])
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   730
apply (iprover intro: minor major [THEN mp])+
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   731
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   732
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   733
(*This version of --> elimination works on Q before P.  It works best for
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   734
  those cases in which P holds "almost everywhere".  Can't install as
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   735
  default: would break old proofs.*)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   736
lemma impCE':
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   737
  assumes major: "P-->Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   738
      and minor: "Q ==> R" "~P ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   739
  shows "R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   740
apply (rule excluded_middle [of P, THEN disjE])
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   741
apply (iprover intro: minor major [THEN mp])+
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   742
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   743
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   744
(*Classical <-> elimination. *)
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   745
lemma iffCE:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   746
  assumes major: "P=Q"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   747
      and minor: "[| P; Q |] ==> R"  "[| ~P; ~Q |] ==> R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   748
  shows "R"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   749
apply (rule major [THEN iffE])
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
   750
apply (iprover intro: minor elim: impCE notE)
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   751
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   752
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   753
lemma exCI:
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   754
  assumes "ALL x. ~P(x) ==> P(a)"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   755
  shows "EX x. P(x)"
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   756
apply (rule ccontr)
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   757
apply (iprover intro: assms exI allI notI notE [of "\<exists>x. P x"])
15411
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   758
done
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   759
1d195de59497 removal of HOL_Lemmas
paulson
parents: 15380
diff changeset
   760
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   761
subsubsection {* Intuitionistic Reasoning *}
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   762
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   763
lemma impE':
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   764
  assumes 1: "P --> Q"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   765
    and 2: "Q ==> R"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   766
    and 3: "P --> Q ==> P"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   767
  shows R
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   768
proof -
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   769
  from 3 and 1 have P .
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   770
  with 1 have Q by (rule impE)
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   771
  with 2 show R .
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   772
qed
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   773
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   774
lemma allE':
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   775
  assumes 1: "ALL x. P x"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   776
    and 2: "P x ==> ALL x. P x ==> Q"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   777
  shows Q
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   778
proof -
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   779
  from 1 have "P x" by (rule spec)
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   780
  from this and 1 show Q by (rule 2)
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   781
qed
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   782
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   783
lemma notE':
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   784
  assumes 1: "~ P"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   785
    and 2: "~ P ==> P"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
   786
  shows R
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   787
proof -
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   788
  from 2 and 1 have P .
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   789
  with 1 show R by (rule notE)
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   790
qed
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   791
22444
fb80fedd192d added safe intro rules for removing "True" subgoals as well as "~ False" ones.
dixon
parents: 22377
diff changeset
   792
lemma TrueE: "True ==> P ==> P" .
fb80fedd192d added safe intro rules for removing "True" subgoals as well as "~ False" ones.
dixon
parents: 22377
diff changeset
   793
lemma notFalseE: "~ False ==> P ==> P" .
fb80fedd192d added safe intro rules for removing "True" subgoals as well as "~ False" ones.
dixon
parents: 22377
diff changeset
   794
22467
c9357ef01168 TrueElim and notTrueElim tested and added as safe elim rules.
dixon
parents: 22445
diff changeset
   795
lemmas [Pure.elim!] = disjE iffE FalseE conjE exE TrueE notFalseE
15801
d2f5ca3c048d superceded by Pure.thy and CPure.thy;
wenzelm
parents: 15676
diff changeset
   796
  and [Pure.intro!] = iffI conjI impI TrueI notI allI refl
d2f5ca3c048d superceded by Pure.thy and CPure.thy;
wenzelm
parents: 15676
diff changeset
   797
  and [Pure.elim 2] = allE notE' impE'
d2f5ca3c048d superceded by Pure.thy and CPure.thy;
wenzelm
parents: 15676
diff changeset
   798
  and [Pure.intro] = exI disjI2 disjI1
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   799
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   800
lemmas [trans] = trans
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   801
  and [sym] = sym not_sym
15801
d2f5ca3c048d superceded by Pure.thy and CPure.thy;
wenzelm
parents: 15676
diff changeset
   802
  and [Pure.elim?] = iffD1 iffD2 impE
11750
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   803
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   804
use "hologic.ML"
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   805
11438
3d9222b80989 declare trans [trans] (*overridden in theory Calculation*);
wenzelm
parents: 11432
diff changeset
   806
11750
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   807
subsubsection {* Atomizing meta-level connectives *}
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   808
28513
b0b30fd6c264 re-introduces axiom subst
haftmann
parents: 28400
diff changeset
   809
axiomatization where
b0b30fd6c264 re-introduces axiom subst
haftmann
parents: 28400
diff changeset
   810
  eq_reflection: "x = y \<Longrightarrow> x \<equiv> y" (*admissible axiom*)
b0b30fd6c264 re-introduces axiom subst
haftmann
parents: 28400
diff changeset
   811
11750
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   812
lemma atomize_all [atomize]: "(!!x. P x) == Trueprop (ALL x. P x)"
12003
c09427e5f554 removed obsolete (rule equal_intr_rule);
wenzelm
parents: 11989
diff changeset
   813
proof
9488
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   814
  assume "!!x. P x"
23389
aaca6a8e5414 tuned proofs: avoid implicit prems;
wenzelm
parents: 23263
diff changeset
   815
  then show "ALL x. P x" ..
9488
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   816
next
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   817
  assume "ALL x. P x"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   818
  then show "!!x. P x" by (rule allE)
9488
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   819
qed
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   820
11750
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   821
lemma atomize_imp [atomize]: "(A ==> B) == Trueprop (A --> B)"
12003
c09427e5f554 removed obsolete (rule equal_intr_rule);
wenzelm
parents: 11989
diff changeset
   822
proof
9488
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   823
  assume r: "A ==> B"
10383
a092ae7bb2a6 "atomize" for classical tactics;
wenzelm
parents: 9970
diff changeset
   824
  show "A --> B" by (rule impI) (rule r)
9488
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   825
next
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   826
  assume "A --> B" and A
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   827
  then show B by (rule mp)
9488
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   828
qed
f11bece4e2db added all_eq, imp_eq (for blast);
wenzelm
parents: 9352
diff changeset
   829
14749
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   830
lemma atomize_not: "(A ==> False) == Trueprop (~A)"
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   831
proof
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   832
  assume r: "A ==> False"
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   833
  show "~A" by (rule notI) (rule r)
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   834
next
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   835
  assume "~A" and A
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   836
  then show False by (rule notE)
14749
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   837
qed
9ccfd0f59e11 new atomize theorem
paulson
parents: 14690
diff changeset
   838
11750
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   839
lemma atomize_eq [atomize]: "(x == y) == Trueprop (x = y)"
12003
c09427e5f554 removed obsolete (rule equal_intr_rule);
wenzelm
parents: 11989
diff changeset
   840
proof
10432
3dfbc913d184 added axclass inverse and consts inverse, divide (infix "/");
wenzelm
parents: 10383
diff changeset
   841
  assume "x == y"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   842
  show "x = y" by (unfold `x == y`) (rule refl)
10432
3dfbc913d184 added axclass inverse and consts inverse, divide (infix "/");
wenzelm
parents: 10383
diff changeset
   843
next
3dfbc913d184 added axclass inverse and consts inverse, divide (infix "/");
wenzelm
parents: 10383
diff changeset
   844
  assume "x = y"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
   845
  then show "x == y" by (rule eq_reflection)
10432
3dfbc913d184 added axclass inverse and consts inverse, divide (infix "/");
wenzelm
parents: 10383
diff changeset
   846
qed
3dfbc913d184 added axclass inverse and consts inverse, divide (infix "/");
wenzelm
parents: 10383
diff changeset
   847
12023
wenzelm
parents: 12003
diff changeset
   848
lemma atomize_conj [atomize]:
28699
32b6a8f12c1c Removed 'includes meta_term_syntax' and 'includes meta_conjunction_syntax'.
ballarin
parents: 28682
diff changeset
   849
  fixes meta_conjunction :: "prop => prop => prop"  (infixr "&&" 2)
19121
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   850
  shows "(A && B) == Trueprop (A & B)"
12003
c09427e5f554 removed obsolete (rule equal_intr_rule);
wenzelm
parents: 11989
diff changeset
   851
proof
19121
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   852
  assume conj: "A && B"
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   853
  show "A & B"
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   854
  proof (rule conjI)
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   855
    from conj show A by (rule conjunctionD1)
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   856
    from conj show B by (rule conjunctionD2)
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   857
  qed
11953
f98623fdf6ef atomize_conj;
wenzelm
parents: 11824
diff changeset
   858
next
19121
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   859
  assume conj: "A & B"
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   860
  show "A && B"
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   861
  proof -
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   862
    from conj show A ..
d7fd5415a781 simplified Pure conjunction;
wenzelm
parents: 19039
diff changeset
   863
    from conj show B ..
11953
f98623fdf6ef atomize_conj;
wenzelm
parents: 11824
diff changeset
   864
  qed
f98623fdf6ef atomize_conj;
wenzelm
parents: 11824
diff changeset
   865
qed
f98623fdf6ef atomize_conj;
wenzelm
parents: 11824
diff changeset
   866
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   867
lemmas [symmetric, rulify] = atomize_all atomize_imp
18832
6ab4de872a70 declare 'defn' rules;
wenzelm
parents: 18757
diff changeset
   868
  and [symmetric, defn] = atomize_all atomize_imp atomize_eq
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   869
11750
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   870
26580
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   871
subsubsection {* Atomizing elimination rules *}
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   872
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   873
setup AtomizeElim.setup
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   874
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   875
lemma atomize_exL[atomize_elim]: "(!!x. P x ==> Q) == ((EX x. P x) ==> Q)"
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   876
  by rule iprover+
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   877
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   878
lemma atomize_conjL[atomize_elim]: "(A ==> B ==> C) == (A & B ==> C)"
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   879
  by rule iprover+
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   880
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   881
lemma atomize_disjL[atomize_elim]: "((A ==> C) ==> (B ==> C) ==> C) == ((A | B ==> C) ==> C)"
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   882
  by rule iprover+
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   883
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   884
lemma atomize_elimL[atomize_elim]: "(!!B. (A ==> B) ==> B) == Trueprop A" ..
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   885
c3e597a476fd Generic conversion and tactic "atomize_elim" to convert elimination rules
krauss
parents: 26555
diff changeset
   886
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   887
subsection {* Package setup *}
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   888
11750
3e400964893e judgment Trueprop;
wenzelm
parents: 11724
diff changeset
   889
subsubsection {* Classical Reasoner setup *}
9529
d9434a9277a4 lemmas atomize = all_eq imp_eq;
wenzelm
parents: 9488
diff changeset
   890
26411
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   891
lemma imp_elim: "P --> Q ==> (~ R ==> P) ==> (Q ==> R) ==> R"
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   892
  by (rule classical) iprover
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   893
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   894
lemma swap: "~ P ==> (~ R ==> P) ==> R"
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   895
  by (rule classical) iprover
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   896
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   897
lemma thin_refl:
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   898
  "\<And>X. \<lbrakk> x=x; PROP W \<rbrakk> \<Longrightarrow> PROP W" .
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   899
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   900
ML {*
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   901
structure Hypsubst = HypsubstFun(
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   902
struct
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   903
  structure Simplifier = Simplifier
21218
38013c3a77a2 tuned hypsubst setup;
wenzelm
parents: 21210
diff changeset
   904
  val dest_eq = HOLogic.dest_eq
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   905
  val dest_Trueprop = HOLogic.dest_Trueprop
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   906
  val dest_imp = HOLogic.dest_imp
26411
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   907
  val eq_reflection = @{thm eq_reflection}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   908
  val rev_eq_reflection = @{thm meta_eq_to_obj_eq}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   909
  val imp_intr = @{thm impI}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   910
  val rev_mp = @{thm rev_mp}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   911
  val subst = @{thm subst}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   912
  val sym = @{thm sym}
22129
bb2203c93316 tuned ML setup;
wenzelm
parents: 21671
diff changeset
   913
  val thin_refl = @{thm thin_refl};
27572
67cd6ed76446 single_hyp(_meta)_subst_tac: Controlled substitution of a single hyp
krauss
parents: 27338
diff changeset
   914
  val prop_subst = @{lemma "PROP P t ==> PROP prop (x = t ==> PROP P x)"
67cd6ed76446 single_hyp(_meta)_subst_tac: Controlled substitution of a single hyp
krauss
parents: 27338
diff changeset
   915
                     by (unfold prop_def) (drule eq_reflection, unfold)}
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   916
end);
21671
f7d652ffef09 removed legacy ML bindings;
wenzelm
parents: 21547
diff changeset
   917
open Hypsubst;
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   918
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   919
structure Classical = ClassicalFun(
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   920
struct
26411
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   921
  val imp_elim = @{thm imp_elim}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   922
  val not_elim = @{thm notE}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   923
  val swap = @{thm swap}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
   924
  val classical = @{thm classical}
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   925
  val sizef = Drule.size_of_thm
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   926
  val hyp_subst_tacs = [Hypsubst.hyp_subst_tac]
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   927
end);
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   928
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   929
structure BasicClassical: BASIC_CLASSICAL = Classical; 
21671
f7d652ffef09 removed legacy ML bindings;
wenzelm
parents: 21547
diff changeset
   930
open BasicClassical;
22129
bb2203c93316 tuned ML setup;
wenzelm
parents: 21671
diff changeset
   931
27338
2cd6c60cc10b ML_Antiquote.value;
wenzelm
parents: 27326
diff changeset
   932
ML_Antiquote.value "claset"
2cd6c60cc10b ML_Antiquote.value;
wenzelm
parents: 27326
diff changeset
   933
  (Scan.succeed "Classical.local_claset_of (ML_Context.the_local_context ())");
24035
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
   934
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
   935
structure ResAtpset = NamedThmsFun(val name = "atp" val description = "ATP rules");
24286
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
   936
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
   937
structure ResBlacklist = NamedThmsFun(val name = "noatp" val description = "Theorems blacklisted for ATP");
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   938
*}
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   939
25388
5cd130251825 tuned specifications of 'notation';
wenzelm
parents: 25297
diff changeset
   940
text {*ResBlacklist holds theorems blacklisted to sledgehammer. 
24286
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
   941
  These theorems typically produce clauses that are prolific (match too many equality or
25388
5cd130251825 tuned specifications of 'notation';
wenzelm
parents: 25297
diff changeset
   942
  membership literals) and relate to seldom-used facts. Some duplicate other rules.*}
24286
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
   943
21009
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   944
setup {*
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   945
let
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   946
  (*prevent substitution on bool*)
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   947
  fun hyp_subst_tac' i thm = if i <= Thm.nprems_of thm andalso
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   948
    Term.exists_Const (fn ("op =", Type (_, [T, _])) => T <> Type ("bool", []) | _ => false)
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   949
      (nth (Thm.prems_of thm) (i - 1)) then Hypsubst.hyp_subst_tac i thm else no_tac thm;
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   950
in
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   951
  Hypsubst.hypsubst_setup
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   952
  #> ContextRules.addSWrapper (fn tac => hyp_subst_tac' ORELSE' tac)
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   953
  #> Classical.setup
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
   954
  #> ResAtpset.setup
24286
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
   955
  #> ResBlacklist.setup
21009
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   956
end
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   957
*}
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   958
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   959
declare iffI [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   960
  and notI [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   961
  and impI [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   962
  and disjCI [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   963
  and conjI [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   964
  and TrueI [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   965
  and refl [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   966
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   967
declare iffCE [elim!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   968
  and FalseE [elim!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   969
  and impCE [elim!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   970
  and disjE [elim!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   971
  and conjE [elim!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   972
  and conjE [elim!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   973
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   974
declare ex_ex1I [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   975
  and allI [intro!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   976
  and the_equality [intro]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   977
  and exI [intro]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   978
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   979
declare exE [elim!]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   980
  allE [elim]
0eae3fb48936 lifted claset setup from ML to Isar level
haftmann
parents: 20973
diff changeset
   981
22377
61610b1beedf tuned ML setup;
wenzelm
parents: 22218
diff changeset
   982
ML {* val HOL_cs = @{claset} *}
19162
67436e2a16df Added setup for "atpset" (a rule set for ATPs).
mengj
parents: 19138
diff changeset
   983
20223
89d2758ecddf tuned proofs;
wenzelm
parents: 20172
diff changeset
   984
lemma contrapos_np: "~ Q ==> (~ P ==> Q) ==> P"
89d2758ecddf tuned proofs;
wenzelm
parents: 20172
diff changeset
   985
  apply (erule swap)
89d2758ecddf tuned proofs;
wenzelm
parents: 20172
diff changeset
   986
  apply (erule (1) meta_mp)
89d2758ecddf tuned proofs;
wenzelm
parents: 20172
diff changeset
   987
  done
10383
a092ae7bb2a6 "atomize" for classical tactics;
wenzelm
parents: 9970
diff changeset
   988
18689
a50587cd8414 prefer ex1I over ex_ex1I in single-step reasoning;
wenzelm
parents: 18595
diff changeset
   989
declare ex_ex1I [rule del, intro! 2]
a50587cd8414 prefer ex1I over ex_ex1I in single-step reasoning;
wenzelm
parents: 18595
diff changeset
   990
  and ex1I [intro]
a50587cd8414 prefer ex1I over ex_ex1I in single-step reasoning;
wenzelm
parents: 18595
diff changeset
   991
12386
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   992
lemmas [intro?] = ext
9c38ec9eca1c tuned declarations (rules, sym, etc.);
wenzelm
parents: 12354
diff changeset
   993
  and [elim?] = ex1_implies_ex
11977
2e7c54b86763 tuned declaration of rules;
wenzelm
parents: 11953
diff changeset
   994
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   995
(*Better then ex1E for classical reasoner: needs no quantifier duplication!*)
20973
0b8e436ed071 cleaned up HOL bootstrap
haftmann
parents: 20944
diff changeset
   996
lemma alt_ex1E [elim!]:
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   997
  assumes major: "\<exists>!x. P x"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   998
      and prem: "\<And>x. \<lbrakk> P x; \<forall>y y'. P y \<and> P y' \<longrightarrow> y = y' \<rbrakk> \<Longrightarrow> R"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
   999
  shows R
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1000
apply (rule ex1E [OF major])
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1001
apply (rule prem)
22129
bb2203c93316 tuned ML setup;
wenzelm
parents: 21671
diff changeset
  1002
apply (tactic {* ares_tac @{thms allI} 1 *})+
bb2203c93316 tuned ML setup;
wenzelm
parents: 21671
diff changeset
  1003
apply (tactic {* etac (Classical.dup_elim @{thm allE}) 1 *})
bb2203c93316 tuned ML setup;
wenzelm
parents: 21671
diff changeset
  1004
apply iprover
bb2203c93316 tuned ML setup;
wenzelm
parents: 21671
diff changeset
  1005
done
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1006
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1007
ML {*
25388
5cd130251825 tuned specifications of 'notation';
wenzelm
parents: 25297
diff changeset
  1008
structure Blast = BlastFun
5cd130251825 tuned specifications of 'notation';
wenzelm
parents: 25297
diff changeset
  1009
(
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1010
  type claset = Classical.claset
22744
5cbe966d67a2 Isar definitions are now added explicitly to code theorem table
haftmann
parents: 22481
diff changeset
  1011
  val equality_name = @{const_name "op ="}
22993
haftmann
parents: 22839
diff changeset
  1012
  val not_name = @{const_name Not}
26411
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
  1013
  val notE = @{thm notE}
cd74690f3bfb pass imp_elim, swap to classical prover;
wenzelm
parents: 25966
diff changeset
  1014
  val ccontr = @{thm ccontr}
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1015
  val contr_tac = Classical.contr_tac
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1016
  val dup_intr = Classical.dup_intr
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1017
  val hyp_subst_tac = Hypsubst.blast_hyp_subst_tac
21671
f7d652ffef09 removed legacy ML bindings;
wenzelm
parents: 21547
diff changeset
  1018
  val claset = Classical.claset
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1019
  val rep_cs = Classical.rep_cs
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1020
  val cla_modifiers = Classical.cla_modifiers
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1021
  val cla_meth' = Classical.cla_meth'
25388
5cd130251825 tuned specifications of 'notation';
wenzelm
parents: 25297
diff changeset
  1022
);
21671
f7d652ffef09 removed legacy ML bindings;
wenzelm
parents: 21547
diff changeset
  1023
val Blast_tac = Blast.Blast_tac;
f7d652ffef09 removed legacy ML bindings;
wenzelm
parents: 21547
diff changeset
  1024
val blast_tac = Blast.blast_tac;
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1025
*}
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1026
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1027
setup Blast.setup
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1028
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1029
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1030
subsubsection {* Simplifier *}
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1031
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1032
lemma eta_contract_eq: "(%s. f s) = f" ..
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1033
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1034
lemma simp_thms:
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
  1035
  shows not_not: "(~ ~ P) = P"
15354
9234f5765d9c Added > and >= sugar
nipkow
parents: 15288
diff changeset
  1036
  and Not_eq_iff: "((~P) = (~Q)) = (P = Q)"
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
  1037
  and
12436
a2df07fefed7 Replaced several occurrences of "blast" by "rules".
berghofe
parents: 12386
diff changeset
  1038
    "(P ~= Q) = (P = (~Q))"
a2df07fefed7 Replaced several occurrences of "blast" by "rules".
berghofe
parents: 12386
diff changeset
  1039
    "(P | ~P) = True"    "(~P | P) = True"
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1040
    "(x = x) = True"
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1041
  and not_True_eq_False: "(\<not> True) = False"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1042
  and not_False_eq_True: "(\<not> False) = True"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1043
  and
12436
a2df07fefed7 Replaced several occurrences of "blast" by "rules".
berghofe
parents: 12386
diff changeset
  1044
    "(~P) ~= P"  "P ~= (~P)"
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1045
    "(True=P) = P"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1046
  and eq_True: "(P = True) = P"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1047
  and "(False=P) = (~P)"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1048
  and eq_False: "(P = False) = (\<not> P)"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1049
  and
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1050
    "(True --> P) = P"  "(False --> P) = True"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1051
    "(P --> True) = True"  "(P --> P) = True"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1052
    "(P --> False) = (~P)"  "(P --> ~P) = (~P)"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1053
    "(P & True) = P"  "(True & P) = P"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1054
    "(P & False) = False"  "(False & P) = False"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1055
    "(P & P) = P"  "(P & (P & Q)) = (P & Q)"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1056
    "(P & ~P) = False"    "(~P & P) = False"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1057
    "(P | True) = True"  "(True | P) = True"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1058
    "(P | False) = P"  "(False | P) = P"
12436
a2df07fefed7 Replaced several occurrences of "blast" by "rules".
berghofe
parents: 12386
diff changeset
  1059
    "(P | P) = P"  "(P | (P | Q)) = (P | Q)" and
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1060
    "(ALL x. P) = P"  "(EX x. P) = P"  "EX x. x=t"  "EX x. t=x"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1061
    -- {* needed for the one-point-rule quantifier simplification procs *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1062
    -- {* essential for termination!! *} and
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1063
    "!!P. (EX x. x=t & P(x)) = P(t)"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1064
    "!!P. (EX x. t=x & P(x)) = P(t)"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1065
    "!!P. (ALL x. x=t --> P(x)) = P(t)"
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
  1066
    "!!P. (ALL x. t=x --> P(x)) = P(t)"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1067
  by (blast, blast, blast, blast, blast, iprover+)
13421
8fcdf4a26468 simplified locale predicates;
wenzelm
parents: 13412
diff changeset
  1068
14201
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1069
lemma disj_absorb: "(A | A) = A"
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1070
  by blast
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1071
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1072
lemma disj_left_absorb: "(A | (A | B)) = (A | B)"
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1073
  by blast
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1074
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1075
lemma conj_absorb: "(A & A) = A"
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1076
  by blast
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1077
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1078
lemma conj_left_absorb: "(A & (A & B)) = (A & B)"
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1079
  by blast
7ad7ab89c402 some basic new lemmas
paulson
parents: 13764
diff changeset
  1080
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1081
lemma eq_ac:
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
  1082
  shows eq_commute: "(a=b) = (b=a)"
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
  1083
    and eq_left_commute: "(P=(Q=R)) = (Q=(P=R))"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1084
    and eq_assoc: "((P=Q)=R) = (P=(Q=R))" by (iprover, blast+)
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1085
lemma neq_commute: "(a~=b) = (b~=a)" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1086
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1087
lemma conj_comms:
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
  1088
  shows conj_commute: "(P&Q) = (Q&P)"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1089
    and conj_left_commute: "(P&(Q&R)) = (Q&(P&R))" by iprover+
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1090
lemma conj_assoc: "((P&Q)&R) = (P&(Q&R))" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1091
19174
df9de25e87b3 moved the "use" directive
paulson
parents: 19162
diff changeset
  1092
lemmas conj_ac = conj_commute conj_left_commute conj_assoc
df9de25e87b3 moved the "use" directive
paulson
parents: 19162
diff changeset
  1093
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1094
lemma disj_comms:
12937
0c4fd7529467 clarified syntax of ``long'' statements: fixes/assumes/shows;
wenzelm
parents: 12892
diff changeset
  1095
  shows disj_commute: "(P|Q) = (Q|P)"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1096
    and disj_left_commute: "(P|(Q|R)) = (Q|(P|R))" by iprover+
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1097
lemma disj_assoc: "((P|Q)|R) = (P|(Q|R))" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1098
19174
df9de25e87b3 moved the "use" directive
paulson
parents: 19162
diff changeset
  1099
lemmas disj_ac = disj_commute disj_left_commute disj_assoc
df9de25e87b3 moved the "use" directive
paulson
parents: 19162
diff changeset
  1100
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1101
lemma conj_disj_distribL: "(P&(Q|R)) = (P&Q | P&R)" by iprover
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1102
lemma conj_disj_distribR: "((P|Q)&R) = (P&R | Q&R)" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1103
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1104
lemma disj_conj_distribL: "(P|(Q&R)) = ((P|Q) & (P|R))" by iprover
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1105
lemma disj_conj_distribR: "((P&Q)|R) = ((P|R) & (Q|R))" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1106
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1107
lemma imp_conjR: "(P --> (Q&R)) = ((P-->Q) & (P-->R))" by iprover
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1108
lemma imp_conjL: "((P&Q) -->R)  = (P --> (Q --> R))" by iprover
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1109
lemma imp_disjL: "((P|Q) --> R) = ((P-->R)&(Q-->R))" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1110
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1111
text {* These two are specialized, but @{text imp_disj_not1} is useful in @{text "Auth/Yahalom"}. *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1112
lemma imp_disj_not1: "(P --> Q | R) = (~Q --> P --> R)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1113
lemma imp_disj_not2: "(P --> Q | R) = (~R --> P --> Q)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1114
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1115
lemma imp_disj1: "((P-->Q)|R) = (P--> Q|R)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1116
lemma imp_disj2: "(Q|(P-->R)) = (P--> Q|R)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1117
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1118
lemma imp_cong: "(P = P') ==> (P' ==> (Q = Q')) ==> ((P --> Q) = (P' --> Q'))"
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1119
  by iprover
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1120
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1121
lemma de_Morgan_disj: "(~(P | Q)) = (~P & ~Q)" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1122
lemma de_Morgan_conj: "(~(P & Q)) = (~P | ~Q)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1123
lemma not_imp: "(~(P --> Q)) = (P & ~Q)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1124
lemma not_iff: "(P~=Q) = (P = (~Q))" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1125
lemma disj_not1: "(~P | Q) = (P --> Q)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1126
lemma disj_not2: "(P | ~Q) = (Q --> P)"  -- {* changes orientation :-( *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1127
  by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1128
lemma imp_conv_disj: "(P --> Q) = ((~P) | Q)" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1129
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1130
lemma iff_conv_conj_imp: "(P = Q) = ((P --> Q) & (Q --> P))" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1131
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1132
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1133
lemma cases_simp: "((P --> Q) & (~P --> Q)) = Q"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1134
  -- {* Avoids duplication of subgoals after @{text split_if}, when the true and false *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1135
  -- {* cases boil down to the same thing. *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1136
  by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1137
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1138
lemma not_all: "(~ (! x. P(x))) = (? x.~P(x))" by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1139
lemma imp_all: "((! x. P x) --> Q) = (? x. P x --> Q)" by blast
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1140
lemma not_ex: "(~ (? x. P(x))) = (! x.~P(x))" by iprover
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1141
lemma imp_ex: "((? x. P x) --> Q) = (! x. P x --> Q)" by iprover
23403
9e1edc15ef52 added Theorem all_not_ex
chaieb
parents: 23389
diff changeset
  1142
lemma all_not_ex: "(ALL x. P x) = (~ (EX x. ~ P x ))" by blast
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1143
24286
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
  1144
declare All_def [noatp]
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
  1145
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1146
lemma ex_disj_distrib: "(? x. P(x) | Q(x)) = ((? x. P(x)) | (? x. Q(x)))" by iprover
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1147
lemma all_conj_distrib: "(!x. P(x) & Q(x)) = ((! x. P(x)) & (! x. Q(x)))" by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1148
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1149
text {*
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1150
  \medskip The @{text "&"} congruence rule: not included by default!
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1151
  May slow rewrite proofs down by as much as 50\% *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1152
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1153
lemma conj_cong:
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1154
    "(P = P') ==> (P' ==> (Q = Q')) ==> ((P & Q) = (P' & Q'))"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1155
  by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1156
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1157
lemma rev_conj_cong:
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1158
    "(Q = Q') ==> (Q' ==> (P = P')) ==> ((P & Q) = (P' & Q'))"
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1159
  by iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1160
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1161
text {* The @{text "|"} congruence rule: not included by default! *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1162
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1163
lemma disj_cong:
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1164
    "(P = P') ==> (~P' ==> (Q = Q')) ==> ((P | Q) = (P' | Q'))"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1165
  by blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1166
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1167
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1168
text {* \medskip if-then-else rules *}
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1169
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1170
lemma if_True: "(if True then x else y) = x"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1171
  by (unfold if_def) blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1172
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1173
lemma if_False: "(if False then x else y) = y"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1174
  by (unfold if_def) blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1175
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1176
lemma if_P: "P ==> (if P then x else y) = x"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1177
  by (unfold if_def) blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1178
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1179
lemma if_not_P: "~P ==> (if P then x else y) = y"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1180
  by (unfold if_def) blast
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1181
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1182
lemma split_if: "P (if Q then x else y) = ((Q --> P(x)) & (~Q --> P(y)))"
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1183
  apply (rule case_split [of Q])
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents: 15423
diff changeset
  1184
   apply (simplesubst if_P)
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents: 15423
diff changeset
  1185
    prefer 3 apply (simplesubst if_not_P, blast+)
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1186
  done
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1187
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1188
lemma split_if_asm: "P (if Q then x else y) = (~((Q & ~P x) | (~Q & ~P y)))"
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents: 15423
diff changeset
  1189
by (simplesubst split_if, blast)
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1190
24286
7619080e49f0 ATP blacklisting is now in theory data, attribute noatp
paulson
parents: 24280
diff changeset
  1191
lemmas if_splits [noatp] = split_if split_if_asm
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1192
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1193
lemma if_cancel: "(if c then x else x) = x"
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents: 15423
diff changeset
  1194
by (simplesubst split_if, blast)
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1195
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1196
lemma if_eq_cancel: "(if x = y then y else x) = x"
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents: 15423
diff changeset
  1197
by (simplesubst split_if, blast)
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1198
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1199
lemma if_bool_eq_conj: "(if P then Q else R) = ((P-->Q) & (~P-->R))"
19796
d86e7b1fc472 quoted "if";
wenzelm
parents: 19656
diff changeset
  1200
  -- {* This form is useful for expanding @{text "if"}s on the RIGHT of the @{text "==>"} symbol. *}
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1201
  by (rule split_if)
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1202
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1203
lemma if_bool_eq_disj: "(if P then Q else R) = ((P&Q) | (~P&R))"
19796
d86e7b1fc472 quoted "if";
wenzelm
parents: 19656
diff changeset
  1204
  -- {* And this form is useful for expanding @{text "if"}s on the LEFT. *}
15481
fc075ae929e4 the new subst tactic, by Lucas Dixon
paulson
parents: 15423
diff changeset
  1205
  apply (simplesubst split_if, blast)
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1206
  done
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1207
17589
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1208
lemma Eq_TrueI: "P ==> P == True" by (unfold atomize_eq) iprover
58eeffd73be1 renamed rules to iprover
nipkow
parents: 17459
diff changeset
  1209
lemma Eq_FalseI: "~P ==> P == False" by (unfold atomize_eq) iprover
12281
3bd113b8f7a6 converted simp lemmas;
wenzelm
parents: 12256
diff changeset
  1210
15423
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1211
text {* \medskip let rules for simproc *}
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1212
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1213
lemma Let_folded: "f x \<equiv> g x \<Longrightarrow>  Let x f \<equiv> Let x g"
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1214
  by (unfold Let_def)
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1215
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1216
lemma Let_unfold: "f x \<equiv> g \<Longrightarrow>  Let x f \<equiv> g"
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1217
  by (unfold Let_def)
761a4f8e6ad6 added simproc for Let
schirmer
parents: 15411
diff changeset
  1218
16633
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1219
text {*
16999
307b2ec590ff Turned simp_implies into binary operator.
ballarin
parents: 16775
diff changeset
  1220
  The following copy of the implication operator is useful for
307b2ec590ff Turned simp_implies into binary operator.
ballarin
parents: 16775
diff changeset
  1221
  fine-tuning congruence rules.  It instructs the simplifier to simplify
307b2ec590ff Turned simp_implies into binary operator.
ballarin
parents: 16775
diff changeset
  1222
  its premise.
16633
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1223
*}
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1224
17197
917c6e7ca28d simp_implies: proper named infix;
wenzelm
parents: 16999
diff changeset
  1225
constdefs
917c6e7ca28d simp_implies: proper named infix;
wenzelm
parents: 16999
diff changeset
  1226
  simp_implies :: "[prop, prop] => prop"  (infixr "=simp=>" 1)
28562
4e74209f113e `code func` now just `code`
haftmann
parents: 28513
diff changeset
  1227
  [code del]: "simp_implies \<equiv> op ==>"
16633
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1228
18457
356a9f711899 structure ProjectRule;
wenzelm
parents: 17992
diff changeset
  1229
lemma simp_impliesI:
16633
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1230
  assumes PQ: "(PROP P \<Longrightarrow> PROP Q)"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1231
  shows "PROP P =simp=> PROP Q"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1232
  apply (unfold simp_implies_def)
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1233
  apply (rule PQ)
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1234
  apply assumption
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1235
  done
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1236
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1237
lemma simp_impliesE:
25388
5cd130251825 tuned specifications of 'notation';
wenzelm
parents: 25297
diff changeset
  1238
  assumes PQ: "PROP P =simp=> PROP Q"
16633
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1239
  and P: "PROP P"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1240
  and QR: "PROP Q \<Longrightarrow> PROP R"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1241
  shows "PROP R"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1242
  apply (rule QR)
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1243
  apply (rule PQ [unfolded simp_implies_def])
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1244
  apply (rule P)
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1245
  done
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1246
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1247
lemma simp_implies_cong:
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1248
  assumes PP' :"PROP P == PROP P'"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1249
  and P'QQ': "PROP P' ==> (PROP Q == PROP Q')"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1250
  shows "(PROP P =simp=> PROP Q) == (PROP P' =simp=> PROP Q')"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1251
proof (unfold simp_implies_def, rule equal_intr_rule)
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1252
  assume PQ: "PROP P \<Longrightarrow> PROP Q"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1253
  and P': "PROP P'"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1254
  from PP' [symmetric] and P' have "PROP P"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1255
    by (rule equal_elim_rule1)
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
  1256
  then have "PROP Q" by (rule PQ)
16633
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1257
  with P'QQ' [OF P'] show "PROP Q'" by (rule equal_elim_rule1)
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1258
next
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1259
  assume P'Q': "PROP P' \<Longrightarrow> PROP Q'"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1260
  and P: "PROP P"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1261
  from PP' and P have P': "PROP P'" by (rule equal_elim_rule1)
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
  1262
  then have "PROP Q'" by (rule P'Q')
16633
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1263
  with P'QQ' [OF P', symmetric] show "PROP Q"
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1264
    by (rule equal_elim_rule1)
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1265
qed
208ebc9311f2 Implemented trick (due to Tobias Nipkow) for fine-tuning simplification
berghofe
parents: 16587
diff changeset
  1266
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1267
lemma uncurry:
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1268
  assumes "P \<longrightarrow> Q \<longrightarrow> R"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1269
  shows "P \<and> Q \<longrightarrow> R"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
  1270
  using assms by blast
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1271
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1272
lemma iff_allI:
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1273
  assumes "\<And>x. P x = Q x"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1274
  shows "(\<forall>x. P x) = (\<forall>x. Q x)"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
  1275
  using assms by blast
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1276
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1277
lemma iff_exI:
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1278
  assumes "\<And>x. P x = Q x"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1279
  shows "(\<exists>x. P x) = (\<exists>x. Q x)"
23553
af8ae54238f5 use hologic.ML in basic HOL context;
wenzelm
parents: 23530
diff changeset
  1280
  using assms by blast
20944
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1281
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1282
lemma all_comm:
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1283
  "(\<forall>x y. P x y) = (\<forall>y x. P x y)"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1284
  by blast
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1285
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1286
lemma ex_comm:
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1287
  "(\<exists>x y. P x y) = (\<exists>y x. P x y)"
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1288
  by blast
34b2c1bb7178 cleanup basic HOL bootstrap
haftmann
parents: 20833
diff changeset
  1289
9869
95dca9f991f2 improved meson setup;
wenzelm
parents: 9852
diff changeset
  1290
use "simpdata.ML"
21671
f7d652ffef09 removed legacy ML bindings;
wenzelm
parents: 21547
diff changeset
  1291
ML {* open Simpdata *}
f7d652ffef09 removed legacy ML bindings;
wenzelm
parents: 21547
diff changeset
  1292
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1293
setup {*
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1294
  Simplifier.method_setup Splitter.split_modifiers
26496
49ae9456eba9 purely functional setup of claset/simpset/clasimpset;
wenzelm
parents: 26411
diff changeset
  1295
  #> Simplifier.map_simpset (K Simpdata.simpset_simprocs)
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1296
  #> Splitter.setup
26496
49ae9456eba9 purely functional setup of claset/simpset/clasimpset;
wenzelm
parents: 26411
diff changeset
  1297
  #> clasimp_setup
21151
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1298
  #> EqSubst.setup
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1299
*}
25bd46916c12 simplified reasoning tools setup
haftmann
parents: 21112
diff changeset
  1300
24035
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1301
text {* Simproc for proving @{text "(y = x) == False"} from premise @{text "~(x = y)"}: *}
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1302
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1303
simproc_setup neq ("x = y") = {* fn _ =>
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1304
let
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1305
  val neq_to_EQ_False = @{thm not_sym} RS @{thm Eq_FalseI};
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1306
  fun is_neq eq lhs rhs thm =
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1307
    (case Thm.prop_of thm of
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1308
      _ $ (Not $ (eq' $ l' $ r')) =>
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1309
        Not = HOLogic.Not andalso eq' = eq andalso
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1310
        r' aconv lhs andalso l' aconv rhs
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1311
    | _ => false);
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1312
  fun proc ss ct =
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1313
    (case Thm.term_of ct of
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1314
      eq $ lhs $ rhs =>
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1315
        (case find_first (is_neq eq lhs rhs) (Simplifier.prems_of_ss ss) of
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1316
          SOME thm => SOME (thm RS neq_to_EQ_False)
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1317
        | NONE => NONE)
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1318
     | _ => NONE);
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1319
in proc end;
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1320
*}
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1321
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1322
simproc_setup let_simp ("Let x f") = {*
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1323
let
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1324
  val (f_Let_unfold, x_Let_unfold) =
28741
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1325
    let val [(_ $ (f $ x) $ _)] = prems_of @{thm Let_unfold}
24035
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1326
    in (cterm_of @{theory} f, cterm_of @{theory} x) end
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1327
  val (f_Let_folded, x_Let_folded) =
28741
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1328
    let val [(_ $ (f $ x) $ _)] = prems_of @{thm Let_folded}
24035
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1329
    in (cterm_of @{theory} f, cterm_of @{theory} x) end;
74c032aea9ed simplified ResAtpset via NamedThmsFun;
wenzelm
parents: 23948
diff changeset
  1330
  val g_Let_folded =
28741
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1331
    let val [(_ $ _ $ (g $ _))] = prems_of @{thm Let_folded}
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1332
    in cterm_of @{theory} g end;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1333
  fun count_loose (Bound i) k = if i >= k then 1 else 0
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1334
    | count_loose (s $ t) k = count_loose s k + count_loose t k
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1335
    | count_loose (Abs (_, _, t)) k = count_loose  t (k + 1)
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1336
    | count_loose _ _ = 0;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1337
  fun is_trivial_let (Const (@{const_name Let}, _) $ x $ t) =
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1338
   case t
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1339
    of Abs (_, _, t') => count_loose t' 0 <= 1
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1340
     | _ => true;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1341
in fn _ => fn ss => fn ct => if is_trivial_let (Thm.term_of ct)
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1342
  then SOME @{thm Let_def} (*no or one ocurrenc of bound variable*)
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1343
  else let (*Norbert Schirmer's case*)
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1344
    val ctxt = Simplifier.the_context ss;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1345
    val thy = ProofContext.theory_of ctxt;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1346
    val t = Thm.term_of ct;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1347
    val ([t'], ctxt') = Variable.import_terms false [t] ctxt;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1348
  in Option.map (hd o Variable.export ctxt' ctxt o single)
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1349
    (case t' of Const (@{const_name Let},_) $ x $ f => (* x and f are already in normal form *)
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1350
      if is_Free x orelse is_Bound x orelse is_Const x
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1351
      then SOME @{thm Let_def}
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1352
      else
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1353
        let
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1354
          val n = case f of (Abs (x, _, _)) => x | _ => "x";
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1355
          val cx = cterm_of thy x;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1356
          val {T = xT, ...} = rep_cterm cx;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1357
          val cf = cterm_of thy f;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1358
          val fx_g = Simplifier.rewrite ss (Thm.capply cf cx);
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1359
          val (_ $ _ $ g) = prop_of fx_g;
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1360
          val g' = abstract_over (x,g);
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1361
        in (if (g aconv g')
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1362
             then
1b257449f804 simproc for let
haftmann
parents: 28699
diff changeset
  1363
                let
1b257449f804 simproc for let
haftmann
parents: 28699