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(* Title: HOL/ex/PiSets.thy
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ID: $Id$
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Author: Florian Kammueller, University of Cambridge
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Pi sets and their application.
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*)
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(* One abbreviation for my major simp application *)
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fun afs thms = (asm_full_simp_tac (simpset() addsimps thms));
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(* strip outer quantifiers and lift implication *)
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fun strip i = (REPEAT ((rtac ballI i)
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ORELSE (rtac allI i)
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ORELSE (rtac impI i)));
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(* eresolve but leave the eliminated assumptions (improves unification) *)
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goal HOL.thy "!! P. [| P |] ==> P & P";
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by (Fast_tac 1);
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val double = result();
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fun re_tac rule r i = ((rotate_tac (r - 1) i)
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THEN (dtac double i)
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THEN (rotate_tac ~1 i)
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THEN (etac conjE i)
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THEN (rotate_tac ~1 i)
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THEN (etac rule i));
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(* individual theorems for convenient use *)
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val [p1,p2] = goal HOL.thy "[|P == Q; P|] ==> Q";
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by (fold_goals_tac [p1]);
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br p2 1;
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val apply_def = result();
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goal HOL.thy "!! P x y. x = y ==> P(x) = P(y)";
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be ssubst 1;
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br refl 1;
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val extend = result();
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val [p1] = goal HOL.thy "P ==> ~~P";
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br notI 1;
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br (p1 RSN(2, notE)) 1;
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ba 1;
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val notnotI = result();
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val [p1] = goal Set.thy "? x. x: S ==> S ~= {}";
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br contrapos 1;
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br (p1 RS notnotI) 1;
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be ssubst 1;
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br notI 1;
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be exE 1;
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be emptyE 1;
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val ExEl_NotEmpty = result();
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val [p1] = goal HOL.thy "~x ==> x = False";
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val l1 = (p1 RS (not_def RS apply_def)) RS mp;
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val l2 = read_instantiate [("P","x")] FalseE;
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br iffI 1;
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br l1 1;
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br l2 2;
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ba 1;
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ba 1;
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val NoteqFalseEq = result();
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val [p1] = goal HOL.thy "~ (! x. ~P(x)) ==> ? x. P(x)";
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br exCI 1;
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(* 1. ! x. ~ P x ==> P ?a *)
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val l1 = p1 RS NoteqFalseEq;
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(* l1 = (! x. ~ P x) = False *)
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val l2 = l1 RS iffD1;
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val l3 = l1 RS iffD2;
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val l4 = read_instantiate [("P", "P ?a")] FalseE;
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br (l2 RS l4) 1;
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ba 1;
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val NotAllNot_Ex = result();
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val [p1] = goal HOL.thy "~(? x. P(x)) ==> ! x. ~ P(x)";
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br notnotD 1;
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br (p1 RS contrapos) 1;
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br NotAllNot_Ex 1;
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ba 1;
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val NotEx_AllNot = result();
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goal Set.thy "!!S. ~ (? x. x : S) ==> S = {}";
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by (Fast_tac 1);
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val NoEl_Empty = result();
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goal Set.thy "!!S. S ~= {} ==> ? x. x : S";
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by (Fast_tac 1);
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val NotEmpty_ExEl = result();
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goal PiSets.thy "!!S. S = {} ==> ! x. x ~: S";
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by (Fast_tac 1);
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val Empty_NoElem = result();
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val [q1,q2] = goal HOL.thy "[| b = a ; (P a) |] ==> (P b)";
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br (q1 RS ssubst) 1;
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br q2 1;
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val forw_subst = result();
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val [q1,q2] = goal HOL.thy "[| a = b ; (P a) |] ==> (P b)";
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br (q1 RS subst) 1;
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br q2 1;
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val forw_ssubst = result();
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goal Prod.thy "((fst A),(fst(snd A)),(fst (snd (snd A))),(snd(snd(snd A)))) = A";
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br (surjective_pairing RS subst) 1;
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br (surjective_pairing RS subst) 1;
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br (surjective_pairing RS subst) 1;
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br refl 1;
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val blow4 = result();
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goal Prod.thy "!! P a b. (%(a,b). P a b) A ==> P (fst A)(snd A)";
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by (Step_tac 1);
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by (afs [fst_conv,snd_conv] 1);
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val apply_pair = result();
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goal Prod.thy "!! P a b c d. (%(a,b,c,d). P a b c d) A \
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\ ==> P (fst A)(fst(snd A))(fst (snd (snd A)))(snd(snd(snd A)))";
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bd (blow4 RS forw_subst) 1;
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by (afs [split_def] 1);
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val apply_quadr = result();
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goal Prod.thy "!! A B x. x: A Times B ==> x = (fst x, snd x)";
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br (surjective_pairing RS subst) 1;
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br refl 1;
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val surj_pair_forw = result();
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goal Prod.thy "!! A B x. x: A Times B ==> fst x: A";
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by (forward_tac [surj_pair_forw] 1);
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bd forw_ssubst 1;
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ba 1;
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be SigmaD1 1;
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val TimesE1 = result();
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goal Prod.thy "!! A B x. x: A Times B ==> snd x: B";
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by (forward_tac [surj_pair_forw] 1);
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bd forw_ssubst 1;
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ba 1;
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be SigmaD2 1;
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val TimesE2 = result();
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(* -> and Pi *)
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goal PiSets.thy "!! A B. A -> B == {f. ! x. if x: A then f(x) : B else f(x) = (@ y. True)}";
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by (simp_tac (simpset() addsimps [Pi_def]) 1);
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val funcset_def = result();
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val [q1,q2] = goal PiSets.thy
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"[| !!x. x: A ==> f x: B x; !!x. x ~: A ==> f(x) = (@ y. True)|] ==> f: Pi A B";
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by (rewrite_goals_tac [Pi_def]);
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br CollectI 1;
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br allI 1;
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by (case_tac "x : A" 1);
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br (if_P RS ssubst) 1;
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ba 1;
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be q1 1;
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br (if_not_P RS ssubst) 1;
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ba 1;
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be q2 1;
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val Pi_I = result();
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goal PiSets.thy
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"!! A f. [| !!x. x: A ==> f x: B; !!x. x ~: A ==> f(x) = (@ y. True)|] ==> f: A -> B";
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by (afs [Pi_I] 1);
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val funcsetI = result();
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val [q1,q2,q3] = goal PiSets.thy
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"[| !! x y. [| x: A; y: B |] ==> f x y: C; \
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\ !! x. [| x ~: A |] ==> f x = (@ y. True);\
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\ !! x y. [| x : A; y ~: B |] ==> f x y = (@ y. True) |] ==> f: A -> B -> C";
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by (simp_tac (simpset() addsimps [q1,q2,q3,funcsetI]) 1);
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val funcsetI2 = result();
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goal PiSets.thy "!! f A B. [|f: A -> B; x: A|] ==> f x: B";
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by (afs [funcset_def] 1);
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val funcsetE1 = result();
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goal PiSets.thy "!! f A B. [|f: Pi A B; x: A|] ==> f x: B x";
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by (afs [Pi_def] 1);
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val PiE1 = result();
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goal PiSets.thy "!! f A B. [|f: A -> B; x~: A|] ==> f x = (@ y. True)";
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by (afs [funcset_def] 1);
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val funcsetE2 = result();
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goal PiSets.thy "!! f A B. [|f: Pi A B; x~: A|] ==> f x = (@ y. True)";
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by (afs [Pi_def] 1);
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val PiE2 = result();
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goal PiSets.thy "!! f A B. [|f: A -> B -> C; x : A; y ~: B|] ==> f x y = (@ y. True)";
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by (afs [funcset_def] 1);
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val funcset2E2 = result();
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goal PiSets.thy "!! f A B C. [| f: A -> B -> C; x: A; y: B |] ==> f x y: C";
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by (afs [funcset_def] 1);
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val funcset2E1 = result();
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goal PiSets.thy "!! f g A B. [| f: A -> B; g: A -> B; ! x: A. f x = g x |]\
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\ ==> f = g";
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br ext 1;
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by (case_tac "x : A" 1);
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by (Fast_tac 1);
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by (fast_tac (claset() addSDs [funcsetE2] addEs [ssubst]) 1);
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val function_extensionality = result();
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goal PiSets.thy "!! f g A B. [| f: Pi A B; g: Pi A B; ! x: A. f x = g x |]\
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\ ==> f = g";
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br ext 1;
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by (case_tac "x : A" 1);
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by (Fast_tac 1);
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by (fast_tac (claset() addSDs [PiE2] addEs [ssubst]) 1);
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val Pi_extensionality = result();
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(* compose *)
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goal PiSets.thy "!! A B C f g. [| f: A -> B; g: B -> C |]==> compose A g f: A -> C";
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br funcsetI 1;
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by (rewrite_goals_tac [compose_def,restrict_def]);
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by (afs [funcsetE1] 1);
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br (if_not_P RS ssubst) 1;
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ba 1;
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br refl 1;
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val funcset_compose = result();
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goal PiSets.thy "!! A B C f g h. [| f: A -> B; g: B -> C; h: C -> D |]\
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\ ==> compose A h (compose A g f) = compose A (compose B h g) f";
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by (res_inst_tac [("A","A")] function_extensionality 1);
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br funcset_compose 1;
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br funcset_compose 1;
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ba 1;
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ba 1;
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ba 1;
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br funcset_compose 1;
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ba 1;
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br funcset_compose 1;
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ba 1;
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ba 1;
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br ballI 1;
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by (rewrite_goals_tac [compose_def,restrict_def]);
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by (afs [funcsetE1,if_P RS ssubst] 1);
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val compose_assoc = result();
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goal PiSets.thy "!! A B C f g x. [| f: A -> B; g: B -> C; x: A |]==> compose A g f x = g(f(x))";
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by (afs [compose_def, restrict_def, if_P RS ssubst] 1);
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val composeE1 = result();
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goal PiSets.thy "!! A B C g f.[| f : A -> B; f `` A = B; g: B -> C; g `` B = C |]\
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\ ==> compose A g f `` A = C";
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br equalityI 1;
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br subsetI 1;
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be imageE 1;
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by (rotate_tac 4 1);
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be ssubst 1;
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br (funcset_compose RS funcsetE1) 1;
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ba 1;
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ba 1;
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ba 1;
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br subsetI 1;
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by (hyp_subst_tac 1);
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be imageE 1;
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by (rotate_tac 3 1);
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be ssubst 1;
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be imageE 1;
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by (rotate_tac 3 1);
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be ssubst 1;
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be (composeE1 RS subst) 1;
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ba 1;
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ba 1;
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br imageI 1;
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ba 1;
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val surj_compose = result();
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goal PiSets.thy "!! A B C g f.[| f : A -> B; g: B -> C; f `` A = B; inj_on f A; inj_on g B |]\
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\ ==> inj_on (compose A g f) A";
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br inj_onI 1;
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by (forward_tac [composeE1] 1);
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ba 1;
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ba 1;
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by (forward_tac [composeE1] 1);
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ba 1;
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by (rotate_tac 7 1);
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ba 1;
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by (step_tac (claset() addSEs [inj_onD]) 1);
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by (rotate_tac 5 1);
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be subst 1;
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be subst 1;
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ba 1;
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be imageI 1;
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be imageI 1;
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val inj_on_compose = result();
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(* restrict / lam *)
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goal PiSets.thy "!! f A B. [| f `` A <= B |] ==> (lam x: A. f x) : A -> B";
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by (rewrite_goals_tac [restrict_def]);
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br funcsetI 1;
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by (afs [if_P RS ssubst] 1);
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be subsetD 1;
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be imageI 1;
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by (afs [if_not_P RS ssubst] 1);
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val restrict_in_funcset = result();
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goal PiSets.thy "!! f A B. [| ! x: A. f x: B |] ==> (lam x: A. f x) : A -> B";
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br restrict_in_funcset 1;
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by (afs [image_def] 1);
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by (Step_tac 1);
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by (Fast_tac 1);
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val restrictI = result();
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goal PiSets.thy "!! f A B. [| ! x: A. f x: B x |] ==> (lam x: A. f x) : Pi A B";
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by (rewrite_goals_tac [restrict_def]);
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br Pi_I 1;
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by (afs [if_P RS ssubst] 1);
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by (Asm_full_simp_tac 1);
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val restrictI_Pi = result();
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(* The following proof has to be redone *)
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goal PiSets.thy "!! f A B C.[| f `` A <= B -> C |] ==> (lam x: A. lam y: B. f x y) : A -> B -> C";
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br restrict_in_funcset 1;
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by (afs [image_def] 1);
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by (afs [Pi_def,subset_def] 1);
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by (afs [restrict_def] 1);
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by (Step_tac 1);
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by (Asm_full_simp_tac 1);
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by (dres_inst_tac [("x","f xa")] spec 1);
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bd mp 1;
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br bexI 1;
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br refl 1;
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ba 1;
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by (dres_inst_tac [("x","xb")] spec 1);
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by (Asm_full_simp_tac 1);
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(* fini 1 *)
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by (Asm_full_simp_tac 1);
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val restrict_in_funcset2 = result();
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goal PiSets.thy "!! f A B C.[| !x: A. ! y: B. f x y: C |] ==> (lam x: A. lam y: B. f x y) : A -> B -> C";
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br restrict_in_funcset 1;
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by (afs [image_def] 1);
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by (afs [Pi_def,subset_def] 1);
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by (afs [restrict_def] 1);
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by (Step_tac 1);
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by (Asm_full_simp_tac 1);
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by (Asm_full_simp_tac 1);
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val restrictI2 = result();
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(* goal PiSets.thy "!! f A B. [| f `` A <= UNION A B |] ==> (lam x: A. f x) : Pi A B"; *)
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goal PiSets.thy "!! f A B. [| x: A |] ==> (lam y: A. f y) x = f x";
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by (afs [restrict_def] 1);
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val restrictE1 = result();
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goal PiSets.thy "!! f A B. [| x: A; f : A -> B |] ==> (lam y: A. f y) x : B";
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by (afs [restrictE1,funcsetE1] 1);
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val restrictE1a = result();
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|
359 |
goal PiSets.thy "!! f A B. [| x ~: A |] ==> (lam y: A. f y) x = (@ y. True)";
|
|
360 |
by (afs [restrict_def] 1);
|
|
361 |
val restrictE2 = result();
|
|
362 |
|
|
363 |
(* It would be nice to have this, but this doesn't work unfortunately
|
|
364 |
see PiSets.ML: Pi_subset1
|
|
365 |
goal PiSets.thy "!! A B. [| A <= B ; ! x: A. f x : C|] ==> (lam x: B. f(x)): A -> C"; *)
|
|
366 |
|
|
367 |
goal PiSets.thy "!! f A B x y. [| x: A; y: B |] ==> \
|
|
368 |
\ (lam a: A. lam b: B. f a b) x y = f x y";
|
|
369 |
by (afs [restrictE1] 1);
|
|
370 |
val restrict2E1 = result();
|
|
371 |
|
|
372 |
(* New restrict2E1: *)
|
|
373 |
goal PiSets.thy "!! A B. [| x : A; y : B x|] ==> (lam a:A. lam b: (B a). f a b) x y = f x y" ;
|
|
374 |
by (afs [restrictE1] 1);
|
|
375 |
val restrict2E1a = result();
|
|
376 |
|
|
377 |
goal PiSets.thy "!! f A B x y. [| x: A; y: B; z: C |] ==> \
|
|
378 |
\ (lam a: A. lam b: B. lam c: C. f a b c) x y z = f x y z";
|
|
379 |
by (afs [restrictE1] 1);
|
|
380 |
val restrict3E1 = result();
|
|
381 |
|
|
382 |
goal PiSets.thy "!! f A B x y. [| x: A; y ~: B |] ==> \
|
|
383 |
\ (lam a: A. lam b: B. f a b) x y = (@ y. True)";
|
|
384 |
by (afs [restrictE1,restrictE2] 1);
|
|
385 |
val restrict2E2 = result();
|
|
386 |
|
|
387 |
|
|
388 |
goal PiSets.thy "!! f g A B. [| ! x: A. f x = g x |]\
|
|
389 |
\ ==> (lam x: A. f x) = (lam x: A. g x)";
|
|
390 |
br ext 1;
|
|
391 |
by (case_tac "x: A" 1);
|
|
392 |
by (afs [restrictE1] 1);
|
|
393 |
by (afs [restrictE2] 1);
|
|
394 |
val restrict_ext = result();
|
|
395 |
|
|
396 |
(* Invers *)
|
|
397 |
|
|
398 |
goal PiSets.thy "!! f A B.[|f `` A = B; x: B |] ==> ? y: A. f y = x";
|
|
399 |
by (rewrite_goals_tac [image_def]);
|
|
400 |
bd equalityD2 1;
|
|
401 |
bd subsetD 1;
|
|
402 |
ba 1;
|
|
403 |
bd CollectD 1;
|
|
404 |
be bexE 1;
|
|
405 |
bd sym 1;
|
|
406 |
be bexI 1;
|
|
407 |
ba 1;
|
|
408 |
val surj_image = result();
|
|
409 |
|
|
410 |
val [q1,q2] = goal PiSets.thy "[| f `` A = B; f : A -> B |] \
|
|
411 |
\ ==> (lam x: B. (Inv A f) x) : B -> A";
|
|
412 |
br restrict_in_funcset 1;
|
|
413 |
by (rewrite_goals_tac [image_def]);
|
|
414 |
br subsetI 1;
|
|
415 |
bd CollectD 1;
|
|
416 |
be bexE 1;
|
|
417 |
be ssubst 1;
|
|
418 |
bd (q1 RS surj_image) 1;
|
|
419 |
be bexE 1;
|
|
420 |
be subst 1;
|
|
421 |
by (rewrite_goals_tac [Inv_def]);
|
|
422 |
by (res_inst_tac [("Q","f(@ ya. ya : A & f ya = f y) = f y")] conjunct1 1);
|
|
423 |
br (q1 RS surj_image RS (Bex_def RS apply_def) RS (Ex_def RS apply_def)) 1;
|
|
424 |
be (q2 RS funcsetE1) 1;
|
|
425 |
val Inv_funcset = result();
|
|
426 |
|
|
427 |
|
|
428 |
val [q1,q2,q3] = goal PiSets.thy "[| f: A -> B; inj_on f A; f `` A = B |]\
|
|
429 |
\ ==> ! x: A. (lam y: B. (Inv A f) y)(f x) = x";
|
|
430 |
br ballI 1;
|
|
431 |
br (restrictE1 RS ssubst) 1;
|
|
432 |
be (q1 RS funcsetE1) 1;
|
|
433 |
by (rewrite_goals_tac [Inv_def]);
|
|
434 |
br (q2 RS inj_onD) 1;
|
|
435 |
ba 3;
|
|
436 |
by (res_inst_tac [("P","(@ y. y : A & f y = f x) : A")] conjunct2 1);
|
|
437 |
br (q3 RS surj_image RS (Bex_def RS apply_def) RS (Ex_def RS apply_def)) 1;
|
|
438 |
be (q1 RS funcsetE1) 1;
|
|
439 |
by (res_inst_tac [("Q","f (@ y. y : A & f y = f x) = f x")] conjunct1 1);
|
|
440 |
br (q3 RS surj_image RS (Bex_def RS apply_def) RS (Ex_def RS apply_def)) 1;
|
|
441 |
be (q1 RS funcsetE1) 1;
|
|
442 |
val Inv_f_f = result();
|
|
443 |
|
|
444 |
val [q1,q2] = goal PiSets.thy "[| f: A -> B; f `` A = B |]\
|
|
445 |
\ ==> ! x: B. f ((lam y: B. (Inv A f y)) x) = x";
|
|
446 |
br ballI 1;
|
|
447 |
br (restrictE1 RS ssubst) 1;
|
|
448 |
ba 1;
|
|
449 |
by (rewrite_goals_tac [Inv_def]);
|
|
450 |
by (res_inst_tac [("P","(@ y. y : A & f y = x) : A")] conjunct2 1);
|
|
451 |
br (q2 RS surj_image RS (Bex_def RS apply_def) RS (Ex_def RS apply_def)) 1;
|
|
452 |
ba 1;
|
|
453 |
val f_Inv_f = result();
|
|
454 |
|
|
455 |
val [q1,q2,q3] = goal PiSets.thy "[| f: A -> B; inj_on f A; f `` A = B |]\
|
|
456 |
\ ==> compose A (lam y:B. (Inv A f) y) f = (lam x: A. x)";
|
|
457 |
br function_extensionality 1;
|
|
458 |
br funcset_compose 1;
|
|
459 |
br q1 1;
|
|
460 |
br (q1 RS (q3 RS Inv_funcset)) 1;
|
|
461 |
br restrict_in_funcset 1;
|
|
462 |
by (Fast_tac 1);
|
|
463 |
br ballI 1;
|
|
464 |
by (afs [compose_def] 1);
|
|
465 |
br (restrictE1 RS ssubst) 1;
|
|
466 |
ba 1;
|
|
467 |
br (restrictE1 RS ssubst) 1;
|
|
468 |
ba 1;
|
|
469 |
be (q3 RS (q2 RS (q1 RS Inv_f_f)) RS bspec) 1;
|
|
470 |
val comp_Inv_id = result();
|
|
471 |
|
|
472 |
|
|
473 |
(* Pi and its application @@ *)
|
|
474 |
|
|
475 |
goal PiSets.thy "!! A B. (PI x: A. B x) ~= {} ==> ! x: A. B(x) ~= {}";
|
|
476 |
bd NotEmpty_ExEl 1;
|
|
477 |
be exE 1;
|
|
478 |
by (rewrite_goals_tac [Pi_def]);
|
|
479 |
bd CollectD 1;
|
|
480 |
br ballI 1;
|
|
481 |
br ExEl_NotEmpty 1;
|
|
482 |
by (res_inst_tac [("x","x xa")] exI 1);
|
|
483 |
by (afs [if_P RS subst] 1);
|
|
484 |
val Pi_total1 = result();
|
|
485 |
|
|
486 |
goal Set.thy "!! M P. ? x: M . P x ==> (~ (! x: M. ~ P x))";
|
|
487 |
by (Fast_tac 1);
|
|
488 |
val SetEx_NotNotAll = result();
|
|
489 |
|
|
490 |
goal PiSets.thy "!! A B. ? x: A. B(x) = {} ==> (PI x: A. B x) = {}";
|
|
491 |
br notnotD 1;
|
|
492 |
br (Pi_total1 RSN(2,contrapos)) 1;
|
|
493 |
ba 2;
|
|
494 |
be SetEx_NotNotAll 1;
|
|
495 |
val Pi_total2 = result();
|
|
496 |
|
|
497 |
val [q1,q2] = goal PiSets.thy "[|a : A; Pi A B ~= {} |] ==> (Pi A B) @@ a = B(a)";
|
|
498 |
by (rewrite_goals_tac [Fset_apply_def]);
|
|
499 |
br equalityI 1;
|
|
500 |
br subsetI 1;
|
|
501 |
be imageE 1;
|
|
502 |
be ssubst 1;
|
|
503 |
by (rewrite_goals_tac [Pi_def]);
|
|
504 |
bd CollectD 1;
|
|
505 |
bd spec 1;
|
|
506 |
br (q1 RS if_P RS subst) 1;
|
|
507 |
ba 1;
|
|
508 |
br subsetI 1;
|
|
509 |
by (rewrite_goals_tac [image_def]);
|
|
510 |
br CollectI 1;
|
|
511 |
br exE 1;
|
|
512 |
br (q2 RS NotEmpty_ExEl) 1;
|
|
513 |
by (res_inst_tac [("x","%y. if (y = a) then x else xa y")] bexI 1);
|
|
514 |
by (Simp_tac 1);
|
|
515 |
by (Simp_tac 1);
|
|
516 |
br allI 1;
|
|
517 |
by (case_tac "xb: A" 1);
|
|
518 |
by (afs [if_P RS ssubst] 1);
|
|
519 |
by (case_tac "xb = a" 1);
|
|
520 |
by (afs [if_P RS ssubst] 1);
|
|
521 |
by (afs [if_not_P RS ssubst] 1);
|
|
522 |
by (rewrite_goals_tac [Pi_def]);
|
|
523 |
by (afs [if_P RS ssubst] 1);
|
|
524 |
by (afs [if_not_P RS ssubst] 1);
|
|
525 |
by (case_tac "xb = a" 1);
|
|
526 |
by (afs [if_P RS ssubst] 1);
|
|
527 |
by (hyp_subst_tac 1);
|
|
528 |
by (afs [q1] 1);
|
|
529 |
by (afs [if_not_P RS ssubst] 1);
|
|
530 |
val Pi_app_def = result();
|
|
531 |
|
|
532 |
goal PiSets.thy "!! a A B C. [| a: A; (PI x: A. PI y: B x. C x y) ~= {} |] ==> (PI y: B a. C a y) ~= {}";
|
|
533 |
bd NotEmpty_ExEl 1;
|
|
534 |
be exE 1;
|
|
535 |
by (rewrite_goals_tac [Pi_def]);
|
|
536 |
bd CollectD 1;
|
|
537 |
bd spec 1;
|
|
538 |
br ExEl_NotEmpty 1;
|
|
539 |
br exI 1;
|
|
540 |
be (if_P RS eq_reflection RS apply_def) 1;
|
|
541 |
ba 1;
|
|
542 |
val NotEmptyPiStep = result();
|
|
543 |
|
|
544 |
val [q1,q2,q3] = goal PiSets.thy
|
|
545 |
"[|a : A; b: B a; (PI x: A. PI y: B x. C x y) ~= {} |] ==> (PI x: A. PI y: B x. C x y) @@ a @@ b = C a b";
|
|
546 |
by (fold_goals_tac [q3 RS (q1 RS NotEmptyPiStep) RS (q2 RS Pi_app_def) RS eq_reflection]);
|
|
547 |
by (fold_goals_tac [q3 RS (q1 RS Pi_app_def) RS eq_reflection]);
|
|
548 |
br refl 1;
|
|
549 |
val Pi_app2_def = result();
|
|
550 |
|
|
551 |
(* Sigma does a better job ( the following is from PiSig.ML) *)
|
|
552 |
goal PiSets.thy "!! A b a. [| a: A; Pi A B ~= {} |]\
|
|
553 |
\ ==> Sigma A B ^^ {a} = Pi A B @@ a";
|
|
554 |
br (Pi_app_def RS ssubst) 1;
|
|
555 |
ba 1;
|
|
556 |
ba 1;
|
|
557 |
by (afs [Sigma_def,Domain_def,converse_def,Range_def,Image_def] 1);
|
|
558 |
by (rewrite_goals_tac [Bex_def]);
|
|
559 |
by (Fast_tac 1);
|
|
560 |
val PiSig_image_eq = result();
|
|
561 |
|
|
562 |
goal PiSets.thy "!! A b a. [| a: A |]\
|
|
563 |
\ ==> Sigma A B ^^ {a} = B a";
|
|
564 |
by (Fast_tac 1);
|
|
565 |
val Sigma_app_def = result();
|
|
566 |
|
|
567 |
(* Bijection between Pi in terms of => and Pi in terms of Sigma *)
|
|
568 |
goal PiSets.thy "!! f. f: Pi A B ==> PiBij A B f <= Sigma A B";
|
|
569 |
by (afs [PiBij_def,Pi_def,restrictE1] 1);
|
|
570 |
br subsetI 1;
|
|
571 |
by (split_all_tac 1);
|
|
572 |
bd CollectD 1;
|
|
573 |
by (Asm_full_simp_tac 1);
|
|
574 |
val PiBij_subset_Sigma = result();
|
|
575 |
|
|
576 |
goal PiSets.thy "!! f. f: Pi A B ==> (! x: A. (?! y. (x, y): (PiBij A B f)))";
|
|
577 |
by (afs [PiBij_def,restrictE1] 1);
|
|
578 |
br ballI 1;
|
|
579 |
br ex1I 1;
|
|
580 |
ba 2;
|
|
581 |
br refl 1;
|
|
582 |
val PiBij_unique = result();
|
|
583 |
|
|
584 |
goal PiSets.thy "!! f. f: Pi A B ==> (! x: A. (?! y. y: B x & (x, y): (PiBij A B f)))";
|
|
585 |
by (afs [PiBij_def,restrictE1] 1);
|
|
586 |
br ballI 1;
|
|
587 |
br ex1I 1;
|
|
588 |
be conjunct2 2;
|
|
589 |
by (afs [PiE1] 1);
|
|
590 |
val PiBij_unique2 = result();
|
|
591 |
|
|
592 |
goal PiSets.thy "!! f. f: Pi A B ==> PiBij A B f : Graph A B";
|
|
593 |
by (afs [Graph_def,PiBij_unique,PiBij_subset_Sigma] 1);
|
|
594 |
val PiBij_in_Graph = result();
|
|
595 |
|
|
596 |
goal PiSets.thy "!! A B. PiBij A B: Pi A B -> Graph A B";
|
|
597 |
by (afs [PiBij_def] 1);
|
|
598 |
br restrictI 1;
|
|
599 |
by (strip 1);
|
|
600 |
by (afs [Graph_def] 1);
|
|
601 |
br conjI 1;
|
|
602 |
br subsetI 1;
|
|
603 |
by (strip 2);
|
|
604 |
br ex1I 2;
|
|
605 |
br refl 2;
|
|
606 |
ba 2;
|
|
607 |
by (split_all_tac 1);
|
|
608 |
by (afs [Pi_def] 1);
|
|
609 |
val PiBij_func = result();
|
|
610 |
|
|
611 |
goal PiSets.thy "!! A f g x. [| f: Pi A B; g: Pi A B; \
|
|
612 |
\ {(x, y). x: A & y = f x} = {(x, y). x: A & y = g x}; x: A |]\
|
|
613 |
\ ==> f x = g x";
|
|
614 |
be equalityE 1;
|
|
615 |
by (rewrite_goals_tac [subset_def]);
|
|
616 |
by (dres_inst_tac [("x","(x, f x)")] bspec 1);
|
|
617 |
by (Fast_tac 1);
|
|
618 |
by (Fast_tac 1);
|
|
619 |
val set_eq_lemma = result();
|
|
620 |
|
|
621 |
goal PiSets.thy "!! A B. inj_on (PiBij A B) (Pi A B)";
|
|
622 |
br inj_onI 1;
|
|
623 |
br Pi_extensionality 1;
|
|
624 |
ba 1;
|
|
625 |
ba 1;
|
|
626 |
by (strip 1);
|
|
627 |
by (afs [PiBij_def,restrictE1] 1);
|
|
628 |
by (re_tac set_eq_lemma 2 1);
|
|
629 |
ba 1;
|
|
630 |
ba 2;
|
|
631 |
by (afs [restrictE1] 1);
|
|
632 |
be subst 1;
|
|
633 |
by (afs [restrictE1] 1);
|
|
634 |
val inj_PiBij = result();
|
|
635 |
|
|
636 |
goal HOL.thy "!! P . ?! x. P x ==> ? x. P x";
|
|
637 |
by (Blast_tac 1);
|
|
638 |
val Ex1_Ex = result();
|
|
639 |
|
|
640 |
goal PiSets.thy "!!A B. PiBij A B `` (Pi A B) = Graph A B";
|
|
641 |
br equalityI 1;
|
|
642 |
by (afs [image_def] 1);
|
|
643 |
br subsetI 1;
|
|
644 |
by (Asm_full_simp_tac 1);
|
|
645 |
be bexE 1;
|
|
646 |
be ssubst 1;
|
|
647 |
by (afs [PiBij_in_Graph] 1);
|
|
648 |
br subsetI 1;
|
|
649 |
by (afs [image_def] 1);
|
|
650 |
by (res_inst_tac [("x","lam a: A. @ y. (a, y): x")] bexI 1);
|
|
651 |
br restrictI_Pi 2;
|
|
652 |
by (strip 2);
|
|
653 |
br ex1E 2;
|
|
654 |
by (afs [Graph_def] 2);
|
|
655 |
be conjE 2;
|
|
656 |
bd bspec 2;
|
|
657 |
ba 2;
|
|
658 |
ba 2;
|
|
659 |
br (select_equality RS ssubst) 2;
|
|
660 |
ba 2;
|
|
661 |
by (Blast_tac 2);
|
|
662 |
(* gets hung up on by (afs [Graph_def] 2); *)
|
|
663 |
by (SELECT_GOAL (rewrite_goals_tac [Graph_def]) 2);
|
|
664 |
by (Blast_tac 2);
|
|
665 |
(* x = PiBij A B (lam a:A. @ y. (a, y) : x) *)
|
|
666 |
by (afs [PiBij_def,Graph_def] 1);
|
|
667 |
br (restrictE1 RS ssubst) 1;
|
|
668 |
br restrictI_Pi 1;
|
|
669 |
(* again like the old 2. subgoal *)
|
|
670 |
by (strip 1);
|
|
671 |
br ex1E 1;
|
|
672 |
be conjE 1;
|
|
673 |
bd bspec 1;
|
|
674 |
ba 1;
|
|
675 |
ba 1;
|
|
676 |
br (select_equality RS ssubst) 1;
|
|
677 |
ba 1;
|
|
678 |
by (Blast_tac 1);
|
|
679 |
by (Blast_tac 1);
|
|
680 |
(* *)
|
|
681 |
br equalityI 1;
|
|
682 |
br subsetI 1;
|
|
683 |
br CollectI 1;
|
|
684 |
by (split_all_tac 1);
|
|
685 |
by (Simp_tac 1);
|
|
686 |
br conjI 1;
|
|
687 |
by (Blast_tac 1);
|
|
688 |
be conjE 1;
|
|
689 |
bd subsetD 1;
|
|
690 |
ba 1;
|
|
691 |
bd SigmaD1 1;
|
|
692 |
bd bspec 1;
|
|
693 |
ba 1;
|
|
694 |
br (restrictE1 RS ssubst) 1;
|
|
695 |
ba 1;
|
|
696 |
br sym 1;
|
|
697 |
br select_equality 1;
|
|
698 |
ba 1;
|
|
699 |
by (Blast_tac 1);
|
|
700 |
(* {(xa,y). xa : A & y = (lam a:A. @ y. (a, y) : x) xa} <= x *)
|
|
701 |
br subsetI 1;
|
|
702 |
by (Asm_full_simp_tac 1);
|
|
703 |
by (split_all_tac 1);
|
|
704 |
by (Asm_full_simp_tac 1);
|
|
705 |
be conjE 1;
|
|
706 |
be conjE 1;
|
|
707 |
by (afs [restrictE1] 1);
|
|
708 |
bd bspec 1;
|
|
709 |
ba 1;
|
|
710 |
bd Ex1_Ex 1;
|
|
711 |
by (rewrite_goals_tac [Ex_def]);
|
|
712 |
ba 1;
|
|
713 |
val surj_PiBij = result();
|
|
714 |
|
|
715 |
|
|
716 |
goal PiSets.thy "!! A B. [| f: Pi A B |] ==> \
|
|
717 |
\ (lam y: Graph A B. (Inv (Pi A B)(PiBij A B)) y)(PiBij A B f) = f";
|
|
718 |
br (Inv_f_f RS bspec) 1;
|
|
719 |
ba 4;
|
|
720 |
by (afs [PiBij_func] 1);
|
|
721 |
by (afs [inj_PiBij] 1);
|
|
722 |
by (afs [surj_PiBij] 1);
|
|
723 |
val PiBij_bij1 = result();
|
|
724 |
|
|
725 |
goal PiSets.thy "!! A B. [| f: Graph A B |] ==> \
|
|
726 |
\ (PiBij A B) ((lam y: (Graph A B). (Inv (Pi A B)(PiBij A B)) y) f) = f";
|
|
727 |
br (PiBij_func RS (f_Inv_f RS bspec)) 1;
|
|
728 |
by (afs [surj_PiBij] 1);
|
|
729 |
ba 1;
|
|
730 |
val PiBij_bij2 = result();
|
|
731 |
|
|
732 |
goal PiSets.thy "!! g f. [| ! x. g( f x) = x |] ==> inj f";
|
|
733 |
br injI 1;
|
|
734 |
by (dres_inst_tac [("f","g")] arg_cong 1);
|
|
735 |
by (forw_inst_tac [("x","x")] spec 1);
|
|
736 |
by (rotate_tac 2 1);
|
|
737 |
be subst 1;
|
|
738 |
by (forw_inst_tac [("x","y")] spec 1);
|
|
739 |
by (rotate_tac 2 1);
|
|
740 |
be subst 1;
|
|
741 |
ba 1;
|
|
742 |
val inj_lemma = result();
|
|
743 |
|
|
744 |
goal PiSets.thy "!! g f. [| ! x. g( f x) = x |] ==> surj g";
|
|
745 |
by (afs [surj_def] 1);
|
|
746 |
br allI 1;
|
|
747 |
by (res_inst_tac [("x","f y")] exI 1);
|
|
748 |
bd spec 1;
|
|
749 |
be sym 1;
|
|
750 |
val surj_lemma = result();
|
|
751 |
|
|
752 |
goal PiSets.thy "Pi {} B == {f. !x. f x = (@ y. True)}";
|
|
753 |
by (afs [Pi_def] 1);
|
|
754 |
val empty_Pi = result();
|
|
755 |
|
|
756 |
goal PiSets.thy "(% x. (@ y. True)) : Pi {} B";
|
|
757 |
by (afs [empty_Pi] 1);
|
|
758 |
val empty_Pi_func = result();
|
|
759 |
|
|
760 |
goal Set.thy "!! A B. [| A <= B; x ~: B |] ==> x ~: A";
|
|
761 |
by (Blast_tac 1);
|
|
762 |
val subsetND = result();
|
|
763 |
|
|
764 |
|
|
765 |
goal PiSets.thy "!! A B C . [| ! x: A. B x <= C x |] ==> Pi A B <= Pi A C";
|
|
766 |
br subsetI 1;
|
|
767 |
br Pi_I 1;
|
|
768 |
by (afs [Pi_def] 2);
|
|
769 |
bd bspec 1;
|
|
770 |
ba 1;
|
|
771 |
be subsetD 1;
|
|
772 |
by (afs [PiE1] 1);
|
|
773 |
val Pi_subset1 = result();
|