src/HOL/MiniML/Generalize.ML
author nipkow
Mon, 03 Nov 1997 09:58:06 +0100
changeset 4072 d0d32dd77440
parent 3919 c036caebfc75
child 4089 96fba19bcbe2
permissions -rw-r--r--
expand_option_bind -> split_option_bind
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(* Title:     HOL/MiniML/Generalize.ML
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   ID:        $Id$
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   Author:    Wolfgang Naraschewski and Tobias Nipkow
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   Copyright  1996 TU Muenchen
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*)
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AddSEs [equalityE];
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goal thy "!!A B. free_tv A = free_tv B ==> gen A t = gen B t";
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by (typ.induct_tac "t" 1);
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by (ALLGOALS Asm_simp_tac);
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qed "gen_eq_on_free_tv";
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goal thy "!!t.(free_tv t) <= (free_tv sch) --> gen sch t = (mk_scheme t)";
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by (typ.induct_tac "t" 1);
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by (Asm_simp_tac 1);
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by (Simp_tac 1);
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by (Fast_tac 1);
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qed_spec_mp "gen_without_effect";
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Addsimps [gen_without_effect];
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goal thy "!!A. free_tv (gen ($ S A) t) = free_tv t Int free_tv ($ S A)";
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by (typ.induct_tac "t" 1);
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by (Simp_tac 1);
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by (case_tac "nat : free_tv ($ S A)" 1);
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by (Asm_simp_tac 1);
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by (Fast_tac 1);
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by (Asm_simp_tac 1);
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by (Fast_tac 1);
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by (Asm_full_simp_tac 1);
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by (Fast_tac 1);
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qed "free_tv_gen";
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Addsimps [free_tv_gen];
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goal thy "!!A. free_tv (gen ($ S A) t # $ S A) = free_tv ($ S A)";
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by (Simp_tac 1);
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by (Fast_tac 1);
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qed "free_tv_gen_cons";
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Addsimps [free_tv_gen_cons];
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goal thy "!!A. bound_tv (gen A t1) = (free_tv t1) - (free_tv A)";
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by (typ.induct_tac "t1" 1);
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by (Simp_tac 1);
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by (case_tac "nat : free_tv A" 1);
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by (asm_simp_tac (!simpset addsplits [expand_if]) 1);
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by (asm_simp_tac (!simpset addsplits [expand_if]) 1);
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by (Fast_tac 1);
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by (Asm_simp_tac 1);
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by (Fast_tac 1);
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qed "bound_tv_gen";
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Addsimps [bound_tv_gen];
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goal thy "!!A. new_tv n t --> new_tv n (gen A t)";
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by (typ.induct_tac "t" 1);
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by (Simp_tac 1);
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by (case_tac "nat : free_tv A" 1);
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by (Asm_simp_tac 1);
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by (Asm_simp_tac 1);
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by (Asm_full_simp_tac 1);
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qed_spec_mp "new_tv_compatible_gen";
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goalw thy [gen_ML_def] "!!A. gen A t = gen_ML A t";
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by (typ.induct_tac "t" 1);
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by (simp_tac (!simpset addsimps [free_tv_ML_scheme_list]) 1);
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by (asm_simp_tac (!simpset addsimps [free_tv_ML_scheme_list]) 1);
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qed "gen_eq_gen_ML";
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goal thy "!!S. (free_tv S) Int ((free_tv t) - (free_tv A)) = {} \
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\          --> gen ($ S A) ($ S t) = $ S (gen A t)";
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by (typ.induct_tac "t" 1);
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by (strip_tac 1);
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by (case_tac "nat:(free_tv A)" 1);
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by (Asm_simp_tac 1);
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by (Asm_full_simp_tac 1);
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by (subgoal_tac "nat ~: free_tv S" 1);
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by (Fast_tac 2);
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by (asm_full_simp_tac (!simpset addsimps [free_tv_subst,dom_def,de_Morgan_disj]) 1);
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by (split_tac [expand_if] 1);
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by (cut_facts_tac [free_tv_app_subst_scheme_list] 1);
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by (Fast_tac 1);
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by (Asm_simp_tac 1);
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by (Best_tac 1);
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qed_spec_mp "gen_subst_commutes";
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goal Generalize.thy "free_tv(t::typ) <= free_tv(A) --> bound_typ_inst S (gen A t) = t";
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by (typ.induct_tac "t" 1);
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by (ALLGOALS Asm_simp_tac);
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by (Fast_tac 1);
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qed_spec_mp "bound_typ_inst_gen";
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Addsimps [bound_typ_inst_gen];
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goalw Generalize.thy [le_type_scheme_def,is_bound_typ_instance]
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  "gen ($ S A) ($ S t) <= $ S (gen A t)";
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by (safe_tac (!claset));
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by (rename_tac "R" 1);
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by (res_inst_tac [("x", "(%a. bound_typ_inst R (gen ($S A) (S a)))")] exI 1);
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by (typ.induct_tac "t" 1);
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 by (simp_tac (!simpset addsplits [expand_if]) 1);
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by (Asm_simp_tac 1);
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qed "gen_bound_typ_instance";
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goalw Generalize.thy [le_type_scheme_def,is_bound_typ_instance]
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  "!!A B. free_tv B <= free_tv A ==> gen A t <= gen B t";
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by (safe_tac (!claset));
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by (rename_tac "S" 1);
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by (res_inst_tac [("x","%b. if b:free_tv A then TVar b else S b")] exI 1);
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by (typ.induct_tac "t" 1);
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 by (asm_simp_tac (!simpset addsplits [expand_if]) 1);
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 by (Fast_tac 1);
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by (Asm_simp_tac 1);
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qed "free_tv_subset_gen_le";
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goalw thy [le_type_scheme_def,is_bound_typ_instance] 
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      "!!A. new_tv n A --> gen A t <= gen A ($ (%x. TVar (if x : free_tv A then x else n + x)) t)";
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by (strip_tac 1);
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by (etac exE 1);
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by (hyp_subst_tac 1);
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by (res_inst_tac [("x","(%x. S (if n <= x then x - n else x))")] exI 1);
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by (typ.induct_tac "t" 1);
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by (Simp_tac 1);
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by (case_tac "nat : free_tv A" 1);
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by (asm_simp_tac (!simpset addsplits [expand_if]) 1);
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by (asm_simp_tac (!simpset addsplits [expand_if]) 1);
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by (subgoal_tac "n <= n + nat" 1);
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by (forw_inst_tac [("t","A")] new_tv_le 1);
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by (assume_tac 1);
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by (dtac new_tv_not_free_tv 1);
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by (dtac new_tv_not_free_tv 1);
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by (asm_simp_tac (!simpset addsimps [diff_add_inverse]) 1);
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by (simp_tac (!simpset addsimps [le_add1]) 1);
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by (Asm_simp_tac 1);
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qed_spec_mp "gen_t_le_gen_alpha_t";
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Addsimps [gen_t_le_gen_alpha_t];