src/HOL/Inductive.thy
author berghofe
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(*  Title:      HOL/Inductive.thy
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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    License:    GPL (GNU GENERAL PUBLIC LICENSE)
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*)
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header {* Support for inductive sets and types *}
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theory Inductive = Gfp + Sum_Type + Relation + Record
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files
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  ("Tools/inductive_package.ML")
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  ("Tools/inductive_codegen.ML")
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  ("Tools/datatype_aux.ML")
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  ("Tools/datatype_prop.ML")
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  ("Tools/datatype_rep_proofs.ML")
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  ("Tools/datatype_abs_proofs.ML")
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  ("Tools/datatype_realizer.ML")
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  ("Tools/datatype_package.ML")
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  ("Tools/datatype_codegen.ML")
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  ("Tools/recfun_codegen.ML")
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  ("Tools/primrec_package.ML"):
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subsection {* Inductive sets *}
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text {* Inversion of injective functions. *}
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constdefs
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  myinv :: "('a => 'b) => ('b => 'a)"
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  "myinv (f :: 'a => 'b) == \<lambda>y. THE x. f x = y"
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lemma myinv_f_f: "inj f ==> myinv f (f x) = x"
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proof -
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  assume "inj f"
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  hence "(THE x'. f x' = f x) = (THE x'. x' = x)"
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    by (simp only: inj_eq)
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  also have "... = x" by (rule the_eq_trivial)
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  finally show ?thesis by (unfold myinv_def)
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qed
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lemma f_myinv_f: "inj f ==> y \<in> range f ==> f (myinv f y) = y"
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proof (unfold myinv_def)
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  assume inj: "inj f"
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  assume "y \<in> range f"
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  then obtain x where "y = f x" ..
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  hence x: "f x = y" ..
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  thus "f (THE x. f x = y) = y"
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  proof (rule theI)
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    fix x' assume "f x' = y"
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    with x have "f x' = f x" by simp
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    with inj show "x' = x" by (rule injD)
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  qed
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qed
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hide const myinv
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text {* Package setup. *}
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use "Tools/inductive_package.ML"
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setup InductivePackage.setup
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theorems basic_monos [mono] =
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  subset_refl imp_refl disj_mono conj_mono ex_mono all_mono if_def2
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  Collect_mono in_mono vimage_mono
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  imp_conv_disj not_not de_Morgan_disj de_Morgan_conj
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  not_all not_ex
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  Ball_def Bex_def
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  induct_rulify2
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subsection {* Inductive datatypes and primitive recursion *}
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text {* Package setup. *}
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use "Tools/recfun_codegen.ML"
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setup RecfunCodegen.setup
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use "Tools/datatype_aux.ML"
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use "Tools/datatype_prop.ML"
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use "Tools/datatype_rep_proofs.ML"
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use "Tools/datatype_abs_proofs.ML"
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use "Tools/datatype_realizer.ML"
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use "Tools/datatype_package.ML"
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setup DatatypePackage.setup
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use "Tools/datatype_codegen.ML"
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setup DatatypeCodegen.setup
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use "Tools/inductive_codegen.ML"
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setup InductiveCodegen.setup
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use "Tools/primrec_package.ML"
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end