blanchet@58128: (*  Title:      HOL/BNF_Fixpoint_Base.thy
blanchet@53311:     Author:     Lorenz Panny, TU Muenchen
blanchet@49308:     Author:     Dmitriy Traytel, TU Muenchen
blanchet@49308:     Author:     Jasmin Blanchette, TU Muenchen
blanchet@57698:     Author:     Martin Desharnais, TU Muenchen
blanchet@57698:     Copyright   2012, 2013, 2014
blanchet@49308: 
blanchet@58352: Shared fixpoint operations on bounded natural functors.
blanchet@49308: *)
blanchet@49308: 
blanchet@58352: header {* Shared Fixpoint Operations on Bounded Natural Functors *}
blanchet@49308: 
blanchet@58128: theory BNF_Fixpoint_Base
blanchet@58128: imports BNF_Composition Basic_BNFs
blanchet@49308: begin
blanchet@49308: 
desharna@57525: lemma False_imp_eq_True: "(False \<Longrightarrow> Q) \<equiv> Trueprop True"
desharna@57525:   by default simp_all
desharna@57525: 
desharna@57525: lemma conj_imp_eq_imp_imp: "(P \<and> Q \<Longrightarrow> PROP R) \<equiv> (P \<Longrightarrow> Q \<Longrightarrow> PROP R)"
desharna@57525:   by default simp_all
desharna@57525: 
blanchet@49590: lemma mp_conj: "(P \<longrightarrow> Q) \<and> R \<Longrightarrow> P \<Longrightarrow> R \<and> Q"
blanchet@58159:   by auto
blanchet@49590: 
desharna@57303: lemma predicate2D_conj: "P \<le> Q \<and> R \<Longrightarrow> P x y \<Longrightarrow> R \<and> Q x y"
desharna@57302:   by auto
desharna@57302: 
blanchet@49591: lemma eq_sym_Unity_conv: "(x = (() = ())) = x"
blanchet@58159:   by blast
blanchet@49585: 
blanchet@55414: lemma case_unit_Unity: "(case u of () \<Rightarrow> f) = f"
blanchet@58159:   by (cases u) (hypsubst, rule unit.case)
blanchet@49312: 
blanchet@55414: lemma case_prod_Pair_iden: "(case p of (x, y) \<Rightarrow> (x, y)) = p"
blanchet@58159:   by simp
blanchet@49539: 
blanchet@49335: lemma unit_all_impI: "(P () \<Longrightarrow> Q ()) \<Longrightarrow> \<forall>x. P x \<longrightarrow> Q x"
blanchet@58159:   by simp
blanchet@49335: 
blanchet@49683: lemma pointfree_idE: "f \<circ> g = id \<Longrightarrow> f (g x) = x"
blanchet@58159:   unfolding comp_def fun_eq_iff by simp
blanchet@49312: 
blanchet@49312: lemma o_bij:
blanchet@49683:   assumes gf: "g \<circ> f = id" and fg: "f \<circ> g = id"
blanchet@49312:   shows "bij f"
blanchet@49312: unfolding bij_def inj_on_def surj_def proof safe
blanchet@49312:   fix a1 a2 assume "f a1 = f a2"
blanchet@49312:   hence "g ( f a1) = g (f a2)" by simp
blanchet@49312:   thus "a1 = a2" using gf unfolding fun_eq_iff by simp
blanchet@49312: next
blanchet@49312:   fix b
blanchet@49312:   have "b = f (g b)"
blanchet@49312:   using fg unfolding fun_eq_iff by simp
blanchet@49312:   thus "EX a. b = f a" by blast
blanchet@49312: qed
blanchet@49312: 
blanchet@58159: lemma ssubst_mem: "\<lbrakk>t = s; s \<in> X\<rbrakk> \<Longrightarrow> t \<in> X"
blanchet@58159:   by simp
blanchet@49312: 
blanchet@55414: lemma case_sum_step:
blanchet@58159:   "case_sum (case_sum f' g') g (Inl p) = case_sum f' g' p"
blanchet@58159:   "case_sum f (case_sum f' g') (Inr p) = case_sum f' g' p"
blanchet@58159:   by auto
blanchet@49312: 
blanchet@49312: lemma obj_one_pointE: "\<forall>x. s = x \<longrightarrow> P \<Longrightarrow> P"
blanchet@58159:   by blast
blanchet@49312: 
traytel@55803: lemma type_copy_obj_one_point_absE:
traytel@55811:   assumes "type_definition Rep Abs UNIV" "\<forall>x. s = Abs x \<longrightarrow> P" shows P
traytel@55811:   using type_definition.Rep_inverse[OF assms(1)]
traytel@55811:   by (intro mp[OF spec[OF assms(2), of "Rep s"]]) simp
traytel@55803: 
blanchet@49312: lemma obj_sumE_f:
traytel@55811:   assumes "\<forall>x. s = f (Inl x) \<longrightarrow> P" "\<forall>x. s = f (Inr x) \<longrightarrow> P"
traytel@55811:   shows "\<forall>x. s = f x \<longrightarrow> P"
traytel@55811: proof
traytel@55811:   fix x from assms show "s = f x \<longrightarrow> P" by (cases x) auto
traytel@55811: qed
blanchet@49312: 
blanchet@55414: lemma case_sum_if:
blanchet@58159:   "case_sum f g (if p then Inl x else Inr y) = (if p then f x else g y)"
blanchet@58159:   by simp
blanchet@49312: 
blanchet@49429: lemma prod_set_simps:
blanchet@58159:   "fsts (x, y) = {x}"
blanchet@58159:   "snds (x, y) = {y}"
blanchet@58159:   unfolding fsts_def snds_def by simp+
blanchet@49429: 
blanchet@49429: lemma sum_set_simps:
blanchet@58159:   "setl (Inl x) = {x}"
blanchet@58159:   "setl (Inr x) = {}"
blanchet@58159:   "setr (Inl x) = {}"
blanchet@58159:   "setr (Inr x) = {x}"
blanchet@58159:   unfolding sum_set_defs by simp+
blanchet@49429: 
desharna@57301: lemma Inl_Inr_False: "(Inl x = Inr y) = False"
desharna@57301:   by simp
desharna@57301: 
desharna@57471: lemma Inr_Inl_False: "(Inr x = Inl y) = False"
desharna@57471:   by simp
desharna@57471: 
traytel@52505: lemma spec2: "\<forall>x y. P x y \<Longrightarrow> P x y"
blanchet@58159:   by blast
traytel@52505: 
blanchet@56640: lemma rewriteR_comp_comp: "\<lbrakk>g \<circ> h = r\<rbrakk> \<Longrightarrow> f \<circ> g \<circ> h = f \<circ> r"
blanchet@55066:   unfolding comp_def fun_eq_iff by auto
traytel@52913: 
blanchet@56640: lemma rewriteR_comp_comp2: "\<lbrakk>g \<circ> h = r1 \<circ> r2; f \<circ> r1 = l\<rbrakk> \<Longrightarrow> f \<circ> g \<circ> h = l \<circ> r2"
blanchet@55066:   unfolding comp_def fun_eq_iff by auto
traytel@52913: 
blanchet@56640: lemma rewriteL_comp_comp: "\<lbrakk>f \<circ> g = l\<rbrakk> \<Longrightarrow> f \<circ> (g \<circ> h) = l \<circ> h"
blanchet@55066:   unfolding comp_def fun_eq_iff by auto
traytel@52913: 
blanchet@56640: lemma rewriteL_comp_comp2: "\<lbrakk>f \<circ> g = l1 \<circ> l2; l2 \<circ> h = r\<rbrakk> \<Longrightarrow> f \<circ> (g \<circ> h) = l1 \<circ> r"
blanchet@55066:   unfolding comp_def fun_eq_iff by auto
traytel@52913: 
wenzelm@57641: lemma convol_o: "\<langle>f, g\<rangle> \<circ> h = \<langle>f \<circ> h, g \<circ> h\<rangle>"
traytel@52913:   unfolding convol_def by auto
traytel@52913: 
wenzelm@57641: lemma map_prod_o_convol: "map_prod h1 h2 \<circ> \<langle>f, g\<rangle> = \<langle>h1 \<circ> f, h2 \<circ> g\<rangle>"
traytel@52913:   unfolding convol_def by auto
traytel@52913: 
wenzelm@57641: lemma map_prod_o_convol_id: "(map_prod f id \<circ> \<langle>id, g\<rangle>) x = \<langle>id \<circ> f, g\<rangle> x"
blanchet@55932:   unfolding map_prod_o_convol id_comp comp_id ..
traytel@52913: 
blanchet@56640: lemma o_case_sum: "h \<circ> case_sum f g = case_sum (h \<circ> f) (h \<circ> g)"
blanchet@55066:   unfolding comp_def by (auto split: sum.splits)
traytel@52913: 
blanchet@56640: lemma case_sum_o_map_sum: "case_sum f g \<circ> map_sum h1 h2 = case_sum (f \<circ> h1) (g \<circ> h2)"
blanchet@55066:   unfolding comp_def by (auto split: sum.splits)
traytel@52913: 
blanchet@56640: lemma case_sum_o_map_sum_id: "(case_sum id g \<circ> map_sum f id) x = case_sum (f \<circ> id) g x"
blanchet@55931:   unfolding case_sum_o_map_sum id_comp comp_id ..
traytel@52913: 
blanchet@55945: lemma rel_fun_def_butlast:
blanchet@55945:   "rel_fun R (rel_fun S T) f g = (\<forall>x y. R x y \<longrightarrow> (rel_fun S T) (f x) (g y))"
blanchet@55945:   unfolding rel_fun_def ..
traytel@52731: 
traytel@53105: lemma subst_eq_imp: "(\<forall>a b. a = b \<longrightarrow> P a b) \<equiv> (\<forall>a. P a a)"
traytel@53105:   by auto
traytel@53105: 
traytel@53105: lemma eq_subset: "op = \<le> (\<lambda>a b. P a b \<or> a = b)"
traytel@53105:   by auto
traytel@53105: 
blanchet@53308: lemma eq_le_Grp_id_iff: "(op = \<le> Grp (Collect R) id) = (All R)"
blanchet@53308:   unfolding Grp_def id_apply by blast
blanchet@53308: 
blanchet@53308: lemma Grp_id_mono_subst: "(\<And>x y. Grp P id x y \<Longrightarrow> Grp Q id (f x) (f y)) \<equiv>
blanchet@53308:    (\<And>x. x \<in> P \<Longrightarrow> f x \<in> Q)"
blanchet@53308:   unfolding Grp_def by rule auto
blanchet@53308: 
traytel@55803: lemma vimage2p_mono: "vimage2p f g R x y \<Longrightarrow> R \<le> S \<Longrightarrow> vimage2p f g S x y"
traytel@55803:   unfolding vimage2p_def by blast
traytel@55803: 
traytel@55803: lemma vimage2p_refl: "(\<And>x. R x x) \<Longrightarrow> vimage2p f f R x x"
traytel@55803:   unfolding vimage2p_def by auto
traytel@55803: 
traytel@55803: lemma
traytel@55803:   assumes "type_definition Rep Abs UNIV"
blanchet@56640:   shows type_copy_Rep_o_Abs: "Rep \<circ> Abs = id" and type_copy_Abs_o_Rep: "Abs \<circ> Rep = id"
traytel@55803:   unfolding fun_eq_iff comp_apply id_apply
traytel@55803:     type_definition.Abs_inverse[OF assms UNIV_I] type_definition.Rep_inverse[OF assms] by simp_all
traytel@55803: 
traytel@55803: lemma type_copy_map_comp0_undo:
traytel@55803:   assumes "type_definition Rep Abs UNIV"
traytel@55803:           "type_definition Rep' Abs' UNIV"
traytel@55803:           "type_definition Rep'' Abs'' UNIV"
blanchet@56640:   shows "Abs' \<circ> M \<circ> Rep'' = (Abs' \<circ> M1 \<circ> Rep) \<circ> (Abs \<circ> M2 \<circ> Rep'') \<Longrightarrow> M1 \<circ> M2 = M"
traytel@55803:   by (rule sym) (auto simp: fun_eq_iff type_definition.Abs_inject[OF assms(2) UNIV_I UNIV_I]
traytel@55803:     type_definition.Abs_inverse[OF assms(1) UNIV_I]
traytel@55803:     type_definition.Abs_inverse[OF assms(3) UNIV_I] dest: spec[of _ "Abs'' x" for x])
traytel@55803: 
blanchet@55854: lemma vimage2p_id: "vimage2p id id R = R"
blanchet@55854:   unfolding vimage2p_def by auto
blanchet@55854: 
blanchet@56640: lemma vimage2p_comp: "vimage2p (f1 \<circ> f2) (g1 \<circ> g2) = vimage2p f2 g2 \<circ> vimage2p f1 g1"
traytel@55803:   unfolding fun_eq_iff vimage2p_def o_apply by simp
traytel@55803: 
blanchet@56650: lemma fun_cong_unused_0: "f = (\<lambda>x. g) \<Longrightarrow> f (\<lambda>x. 0) = g"
blanchet@56650:   by (erule arg_cong)
blanchet@56650: 
blanchet@56684: lemma inj_on_convol_ident: "inj_on (\<lambda>x. (x, f x)) X"
blanchet@56650:   unfolding inj_on_def by simp
blanchet@56650: 
blanchet@56650: lemma case_prod_app: "case_prod f x y = case_prod (\<lambda>l r. f l r y) x"
blanchet@56650:   by (case_tac x) simp
blanchet@56650: 
blanchet@56650: lemma case_sum_map_sum: "case_sum l r (map_sum f g x) = case_sum (l \<circ> f) (r \<circ> g) x"
blanchet@56650:   by (case_tac x) simp+
blanchet@56650: 
blanchet@56650: lemma case_prod_map_prod: "case_prod h (map_prod f g x) = case_prod (\<lambda>l r. h (f l) (g r)) x"
blanchet@56650:   by (case_tac x) simp+
blanchet@56650: 
blanchet@56650: lemma prod_inj_map: "inj f \<Longrightarrow> inj g \<Longrightarrow> inj (map_prod f g)"
blanchet@56650:   by (simp add: inj_on_def)
blanchet@56650: 
desharna@57489: lemma eq_ifI: "(P \<longrightarrow> t = u1) \<Longrightarrow> (\<not> P \<longrightarrow> t = u2) \<Longrightarrow> t = (if P then u1 else u2)"
desharna@57489:   by simp
desharna@57489: 
blanchet@55062: ML_file "Tools/BNF/bnf_fp_util.ML"
blanchet@55062: ML_file "Tools/BNF/bnf_fp_def_sugar_tactics.ML"
blanchet@55062: ML_file "Tools/BNF/bnf_fp_def_sugar.ML"
blanchet@55062: ML_file "Tools/BNF/bnf_fp_n2m_tactics.ML"
blanchet@55062: ML_file "Tools/BNF/bnf_fp_n2m.ML"
blanchet@55062: ML_file "Tools/BNF/bnf_fp_n2m_sugar.ML"
blanchet@55702: 
blanchet@49308: end