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(* Title: CCL/equalities
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ID: $Id$
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Modified version of
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Title: HOL/equalities
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory
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Copyright 1991 University of Cambridge
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Equalities involving union, intersection, inclusion, etc.
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*)
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writeln"File HOL/equalities";
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val eq_cs = set_cs addSIs [equalityI];
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(** Binary Intersection **)
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goal Set.thy "A Int A = A";
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by (fast_tac eq_cs 1);
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val Int_absorb = result();
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goal Set.thy "A Int B = B Int A";
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by (fast_tac eq_cs 1);
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val Int_commute = result();
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goal Set.thy "(A Int B) Int C = A Int (B Int C)";
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by (fast_tac eq_cs 1);
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val Int_assoc = result();
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goal Set.thy "(A Un B) Int C = (A Int C) Un (B Int C)";
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by (fast_tac eq_cs 1);
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val Int_Un_distrib = result();
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goal Set.thy "(A<=B) <-> (A Int B = A)";
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by (fast_tac (eq_cs addSEs [equalityE]) 1);
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val subset_Int_eq = result();
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(** Binary Union **)
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goal Set.thy "A Un A = A";
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by (fast_tac eq_cs 1);
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val Un_absorb = result();
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goal Set.thy "A Un B = B Un A";
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by (fast_tac eq_cs 1);
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val Un_commute = result();
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goal Set.thy "(A Un B) Un C = A Un (B Un C)";
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by (fast_tac eq_cs 1);
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val Un_assoc = result();
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goal Set.thy "(A Int B) Un C = (A Un C) Int (B Un C)";
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by (fast_tac eq_cs 1);
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val Un_Int_distrib = result();
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goal Set.thy
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"(A Int B) Un (B Int C) Un (C Int A) = (A Un B) Int (B Un C) Int (C Un A)";
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by (fast_tac eq_cs 1);
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val Un_Int_crazy = result();
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goal Set.thy "(A<=B) <-> (A Un B = B)";
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by (fast_tac (eq_cs addSEs [equalityE]) 1);
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val subset_Un_eq = result();
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(** Simple properties of Compl -- complement of a set **)
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goal Set.thy "A Int Compl(A) = {x.False}";
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by (fast_tac eq_cs 1);
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val Compl_disjoint = result();
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goal Set.thy "A Un Compl(A) = {x.True}";
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by (fast_tac eq_cs 1);
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val Compl_partition = result();
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goal Set.thy "Compl(Compl(A)) = A";
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by (fast_tac eq_cs 1);
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val double_complement = result();
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goal Set.thy "Compl(A Un B) = Compl(A) Int Compl(B)";
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by (fast_tac eq_cs 1);
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val Compl_Un = result();
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goal Set.thy "Compl(A Int B) = Compl(A) Un Compl(B)";
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by (fast_tac eq_cs 1);
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val Compl_Int = result();
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goal Set.thy "Compl(UN x:A. B(x)) = (INT x:A. Compl(B(x)))";
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by (fast_tac eq_cs 1);
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val Compl_UN = result();
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goal Set.thy "Compl(INT x:A. B(x)) = (UN x:A. Compl(B(x)))";
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by (fast_tac eq_cs 1);
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val Compl_INT = result();
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(*Halmos, Naive Set Theory, page 16.*)
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goal Set.thy "((A Int B) Un C = A Int (B Un C)) <-> (C<=A)";
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by (fast_tac (eq_cs addSEs [equalityE]) 1);
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val Un_Int_assoc_eq = result();
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(** Big Union and Intersection **)
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goal Set.thy "Union(A Un B) = Union(A) Un Union(B)";
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by (fast_tac eq_cs 1);
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val Union_Un_distrib = result();
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val prems = goal Set.thy
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"(Union(C) Int A = {x.False}) <-> (ALL B:C. B Int A = {x.False})";
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by (fast_tac (eq_cs addSEs [equalityE]) 1);
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val Union_disjoint = result();
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goal Set.thy "Inter(A Un B) = Inter(A) Int Inter(B)";
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by (best_tac eq_cs 1);
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val Inter_Un_distrib = result();
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(** Unions and Intersections of Families **)
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goal Set.thy "(UN x:A. B(x)) = Union({Y. EX x:A. Y=B(x)})";
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by (fast_tac eq_cs 1);
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val UN_eq = result();
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(*Look: it has an EXISTENTIAL quantifier*)
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goal Set.thy "(INT x:A. B(x)) = Inter({Y. EX x:A. Y=B(x)})";
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by (fast_tac eq_cs 1);
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val INT_eq = result();
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goal Set.thy "A Int Union(B) = (UN C:B. A Int C)";
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by (fast_tac eq_cs 1);
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val Int_Union_image = result();
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goal Set.thy "A Un Inter(B) = (INT C:B. A Un C)";
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by (fast_tac eq_cs 1);
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val Un_Inter_image = result();
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