src/ZF/mono.ML
author paulson
Fri, 16 Feb 1996 18:00:47 +0100
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Elimination of fully-functorial style. Type tactic changed to a type abbrevation (from a datatype). Constructor tactic and function apply deleted.
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(*  Title:      ZF/mono
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    ID:         $Id$
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    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
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    Copyright   1993  University of Cambridge
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Monotonicity of various operations (for lattice properties see subset.ML)
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*)
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(** Replacement, in its various formulations **)
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(*Not easy to express monotonicity in P, since any "bigger" predicate
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  would have to be single-valued*)
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goal ZF.thy "!!A B. A<=B ==> Replace(A,P) <= Replace(B,P)";
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by (fast_tac (ZF_cs addSEs [ReplaceE]) 1);
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qed "Replace_mono";
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goal ZF.thy "!!A B. A<=B ==> {f(x). x:A} <= {f(x). x:B}";
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by (fast_tac ZF_cs 1);
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qed "RepFun_mono";
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goal ZF.thy "!!A B. A<=B ==> Pow(A) <= Pow(B)";
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by (fast_tac ZF_cs 1);
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qed "Pow_mono";
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goal ZF.thy "!!A B. A<=B ==> Union(A) <= Union(B)";
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by (fast_tac ZF_cs 1);
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qed "Union_mono";
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val prems = goal ZF.thy
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    "[| A<=C;  !!x. x:A ==> B(x)<=D(x) \
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\    |] ==> (UN x:A. B(x)) <= (UN x:C. D(x))";
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by (fast_tac (ZF_cs addIs (prems RL [subsetD])) 1);
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qed "UN_mono";
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(*Intersection is ANTI-monotonic.  There are TWO premises! *)
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goal ZF.thy "!!A B. [| A<=B;  a:A |] ==> Inter(B) <= Inter(A)";
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by (fast_tac ZF_cs 1);
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qed "Inter_anti_mono";
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goal ZF.thy "!!C D. C<=D ==> cons(a,C) <= cons(a,D)";
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by (fast_tac ZF_cs 1);
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qed "cons_mono";
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goal ZF.thy "!!A B C D. [| A<=C;  B<=D |] ==> A Un B <= C Un D";
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by (fast_tac ZF_cs 1);
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qed "Un_mono";
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goal ZF.thy "!!A B C D. [| A<=C;  B<=D |] ==> A Int B <= C Int D";
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by (fast_tac ZF_cs 1);
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qed "Int_mono";
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goal ZF.thy "!!A B C D. [| A<=C;  D<=B |] ==> A-B <= C-D";
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by (fast_tac ZF_cs 1);
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qed "Diff_mono";
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(** Standard products, sums and function spaces **)
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goal ZF.thy "!!A B C D. [| A<=C;  ALL x:A. B(x) <= D(x) |] ==> \
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\                       Sigma(A,B) <= Sigma(C,D)";
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by (fast_tac ZF_cs 1);
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qed "Sigma_mono_lemma";
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val Sigma_mono = ballI RSN (2,Sigma_mono_lemma);
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goalw Sum.thy sum_defs "!!A B C D. [| A<=C;  B<=D |] ==> A+B <= C+D";
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by (REPEAT (ares_tac [subset_refl,Un_mono,Sigma_mono] 1));
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qed "sum_mono";
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(*Note that B->A and C->A are typically disjoint!*)
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goal ZF.thy "!!A B C. B<=C ==> A->B <= A->C";
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by (fast_tac (ZF_cs addIs [lam_type] addEs [Pi_lamE]) 1);
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qed "Pi_mono";
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goalw ZF.thy [lam_def] "!!A B. A<=B ==> Lambda(A,c) <= Lambda(B,c)";
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by (etac RepFun_mono 1);
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qed "lam_mono";
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(** Quine-inspired ordered pairs, products, injections and sums **)
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goalw QPair.thy [QPair_def] "!!a b c d. [| a<=c;  b<=d |] ==> <a;b> <= <c;d>";
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by (REPEAT (ares_tac [sum_mono] 1));
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qed "QPair_mono";
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goal QPair.thy "!!A B C D. [| A<=C;  ALL x:A. B(x) <= D(x) |] ==>  \
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\                          QSigma(A,B) <= QSigma(C,D)";
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by (fast_tac qpair_cs 1);
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qed "QSigma_mono_lemma";
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val QSigma_mono = ballI RSN (2,QSigma_mono_lemma);
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goalw QPair.thy [QInl_def] "!!a b. a<=b ==> QInl(a) <= QInl(b)";
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by (REPEAT (ares_tac [subset_refl RS QPair_mono] 1));
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qed "QInl_mono";
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goalw QPair.thy [QInr_def] "!!a b. a<=b ==> QInr(a) <= QInr(b)";
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by (REPEAT (ares_tac [subset_refl RS QPair_mono] 1));
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qed "QInr_mono";
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goal QPair.thy "!!A B C D. [| A<=C;  B<=D |] ==> A <+> B <= C <+> D";
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by (fast_tac qsum_cs 1);
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qed "qsum_mono";
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(** Converse, domain, range, field **)
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goal ZF.thy "!!r s. r<=s ==> converse(r) <= converse(s)";
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by (fast_tac ZF_cs 1);
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qed "converse_mono";
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goal ZF.thy "!!r s. r<=s ==> domain(r)<=domain(s)";
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by (fast_tac ZF_cs 1);
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qed "domain_mono";
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bind_thm ("domain_rel_subset", [domain_mono, domain_subset] MRS subset_trans);
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goal ZF.thy "!!r s. r<=s ==> range(r)<=range(s)";
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by (fast_tac ZF_cs 1);
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qed "range_mono";
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bind_thm ("range_rel_subset", [range_mono, range_subset] MRS subset_trans);
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goal ZF.thy "!!r s. r<=s ==> field(r)<=field(s)";
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by (fast_tac ZF_cs 1);
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qed "field_mono";
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goal ZF.thy "!!r A. r <= A*A ==> field(r) <= A";
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by (etac (field_mono RS subset_trans) 1);
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by (fast_tac ZF_cs 1);
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qed "field_rel_subset";
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(** Images **)
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val [prem1,prem2] = goal ZF.thy
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    "[| !! x y. <x,y>:r ==> <x,y>:s;  A<=B |] ==> r``A <= s``B";
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by (fast_tac (ZF_cs addIs [prem1, prem2 RS subsetD]) 1);
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qed "image_pair_mono";
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val [prem1,prem2] = goal ZF.thy
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    "[| !! x y. <x,y>:r ==> <x,y>:s;  A<=B |] ==> r-``A <= s-``B";
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by (fast_tac (ZF_cs addIs [prem1, prem2 RS subsetD]) 1);
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qed "vimage_pair_mono";
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goal ZF.thy "!!r s. [| r<=s;  A<=B |] ==> r``A <= s``B";
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by (fast_tac ZF_cs 1);
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qed "image_mono";
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goal ZF.thy "!!r s. [| r<=s;  A<=B |] ==> r-``A <= s-``B";
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by (fast_tac ZF_cs 1);
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qed "vimage_mono";
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val [sub,PQimp] = goal ZF.thy
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    "[| A<=B;  !!x. x:A ==> P(x) --> Q(x) |] ==> Collect(A,P) <= Collect(B,Q)";
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by (fast_tac (ZF_cs addIs [sub RS subsetD, PQimp RS mp]) 1);
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qed "Collect_mono";
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(** Monotonicity of implications -- some could go to FOL **)
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goal ZF.thy "!!A B x. A<=B ==> x:A --> x:B";
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by (fast_tac ZF_cs 1);
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qed "in_mono";
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goal IFOL.thy "!!P1 P2 Q1 Q2. [| P1-->Q1; P2-->Q2 |] ==> (P1&P2) --> (Q1&Q2)";
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by (Int.fast_tac 1);
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qed "conj_mono";
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goal IFOL.thy "!!P1 P2 Q1 Q2. [| P1-->Q1; P2-->Q2 |] ==> (P1|P2) --> (Q1|Q2)";
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by (Int.fast_tac 1);
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qed "disj_mono";
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goal IFOL.thy "!!P1 P2 Q1 Q2.[| Q1-->P1; P2-->Q2 |] ==> (P1-->P2)-->(Q1-->Q2)";
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by (Int.fast_tac 1);
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qed "imp_mono";
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goal IFOL.thy "P-->P";
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by (rtac impI 1);
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by (assume_tac 1);
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qed "imp_refl";
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val [PQimp] = goal IFOL.thy
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    "[| !!x. P(x) --> Q(x) |] ==> (EX x.P(x)) --> (EX x.Q(x))";
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by (fast_tac (FOL_cs addIs [PQimp RS mp]) 1);
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qed "ex_mono";
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val [PQimp] = goal IFOL.thy
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    "[| !!x. P(x) --> Q(x) |] ==> (ALL x.P(x)) --> (ALL x.Q(x))";
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by (fast_tac (FOL_cs addIs [PQimp RS mp]) 1);
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qed "all_mono";
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(*Used in intr_elim.ML and in individual datatype definitions*)
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val basic_monos = [subset_refl, imp_refl, disj_mono, conj_mono, 
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                   ex_mono, Collect_mono, Part_mono, in_mono];
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