author | huffman |
Sun, 19 Dec 2010 06:34:41 -0800 | |
changeset 41287 | 029a6fc1bfb8 |
parent 41286 | 3d7685a4a5ff |
child 41290 | e9c9577d88b5 |
permissions | -rw-r--r-- |
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(* Title: HOLCF/Algebraic.thy |
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Author: Brian Huffman |
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*) |
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header {* Algebraic deflations *} |
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theory Algebraic |
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imports Universal Map_Functions |
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begin |
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default_sort bifinite |
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subsection {* Type constructor for finite deflations *} |
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typedef (open) 'a fin_defl = "{d::'a \<rightarrow> 'a. finite_deflation d}" |
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by (fast intro: finite_deflation_UU) |
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instantiation fin_defl :: (bifinite) below |
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begin |
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definition below_fin_defl_def: |
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"below \<equiv> \<lambda>x y. Rep_fin_defl x \<sqsubseteq> Rep_fin_defl y" |
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instance .. |
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end |
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instance fin_defl :: (bifinite) po |
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using type_definition_fin_defl below_fin_defl_def |
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by (rule typedef_po) |
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lemma finite_deflation_Rep_fin_defl: "finite_deflation (Rep_fin_defl d)" |
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using Rep_fin_defl by simp |
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lemma deflation_Rep_fin_defl: "deflation (Rep_fin_defl d)" |
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using finite_deflation_Rep_fin_defl |
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by (rule finite_deflation_imp_deflation) |
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interpretation Rep_fin_defl: finite_deflation "Rep_fin_defl d" |
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by (rule finite_deflation_Rep_fin_defl) |
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lemma fin_defl_belowI: |
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"(\<And>x. Rep_fin_defl a\<cdot>x = x \<Longrightarrow> Rep_fin_defl b\<cdot>x = x) \<Longrightarrow> a \<sqsubseteq> b" |
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unfolding below_fin_defl_def |
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by (rule Rep_fin_defl.belowI) |
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lemma fin_defl_belowD: |
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"\<lbrakk>a \<sqsubseteq> b; Rep_fin_defl a\<cdot>x = x\<rbrakk> \<Longrightarrow> Rep_fin_defl b\<cdot>x = x" |
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unfolding below_fin_defl_def |
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by (rule Rep_fin_defl.belowD) |
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lemma fin_defl_eqI: |
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"(\<And>x. Rep_fin_defl a\<cdot>x = x \<longleftrightarrow> Rep_fin_defl b\<cdot>x = x) \<Longrightarrow> a = b" |
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apply (rule below_antisym) |
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apply (rule fin_defl_belowI, simp) |
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apply (rule fin_defl_belowI, simp) |
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done |
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lemma Rep_fin_defl_mono: "a \<sqsubseteq> b \<Longrightarrow> Rep_fin_defl a \<sqsubseteq> Rep_fin_defl b" |
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unfolding below_fin_defl_def . |
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lemma Abs_fin_defl_mono: |
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"\<lbrakk>finite_deflation a; finite_deflation b; a \<sqsubseteq> b\<rbrakk> |
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\<Longrightarrow> Abs_fin_defl a \<sqsubseteq> Abs_fin_defl b" |
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unfolding below_fin_defl_def |
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by (simp add: Abs_fin_defl_inverse) |
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lemma (in finite_deflation) compact_belowI: |
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assumes "\<And>x. compact x \<Longrightarrow> d\<cdot>x = x \<Longrightarrow> f\<cdot>x = x" shows "d \<sqsubseteq> f" |
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by (rule belowI, rule assms, erule subst, rule compact) |
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lemma compact_Rep_fin_defl [simp]: "compact (Rep_fin_defl a)" |
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using finite_deflation_Rep_fin_defl |
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by (rule finite_deflation_imp_compact) |
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subsection {* Defining algebraic deflations by ideal completion *} |
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typedef (open) 'a defl = "{S::'a fin_defl set. below.ideal S}" |
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by (rule below.ex_ideal) |
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instantiation defl :: (bifinite) below |
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begin |
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definition |
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"x \<sqsubseteq> y \<longleftrightarrow> Rep_defl x \<subseteq> Rep_defl y" |
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instance .. |
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end |
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instance defl :: (bifinite) po |
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using type_definition_defl below_defl_def |
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by (rule below.typedef_ideal_po) |
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instance defl :: (bifinite) cpo |
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using type_definition_defl below_defl_def |
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by (rule below.typedef_ideal_cpo) |
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definition |
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defl_principal :: "'a fin_defl \<Rightarrow> 'a defl" where |
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"defl_principal t = Abs_defl {u. u \<sqsubseteq> t}" |
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lemma fin_defl_countable: "\<exists>f::'a fin_defl \<Rightarrow> nat. inj f" |
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proof - |
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obtain f :: "'a compact_basis \<Rightarrow> nat" where inj_f: "inj f" |
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using compact_basis.countable .. |
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have *: "\<And>d. finite (f ` Rep_compact_basis -` {x. Rep_fin_defl d\<cdot>x = x})" |
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apply (rule finite_imageI) |
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apply (rule finite_vimageI) |
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apply (rule Rep_fin_defl.finite_fixes) |
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apply (simp add: inj_on_def Rep_compact_basis_inject) |
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done |
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have range_eq: "range Rep_compact_basis = {x. compact x}" |
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using type_definition_compact_basis by (rule type_definition.Rep_range) |
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have "inj (\<lambda>d. set_encode |
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(f ` Rep_compact_basis -` {x. Rep_fin_defl d\<cdot>x = x}))" |
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apply (rule inj_onI) |
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apply (simp only: set_encode_eq *) |
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apply (simp only: inj_image_eq_iff inj_f) |
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apply (drule_tac f="image Rep_compact_basis" in arg_cong) |
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apply (simp del: vimage_Collect_eq add: range_eq set_eq_iff) |
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apply (rule Rep_fin_defl_inject [THEN iffD1]) |
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apply (rule below_antisym) |
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apply (rule Rep_fin_defl.compact_belowI, rename_tac z) |
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apply (drule_tac x=z in spec, simp) |
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apply (rule Rep_fin_defl.compact_belowI, rename_tac z) |
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apply (drule_tac x=z in spec, simp) |
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done |
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thus ?thesis by - (rule exI) |
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qed |
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129 |
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interpretation defl: ideal_completion below defl_principal Rep_defl |
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using type_definition_defl below_defl_def |
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using defl_principal_def fin_defl_countable |
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by (rule below.typedef_ideal_completion) |
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text {* Algebraic deflations are pointed *} |
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lemma defl_minimal: "defl_principal (Abs_fin_defl \<bottom>) \<sqsubseteq> x" |
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apply (induct x rule: defl.principal_induct, simp) |
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apply (rule defl.principal_mono) |
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apply (simp add: below_fin_defl_def) |
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apply (simp add: Abs_fin_defl_inverse finite_deflation_UU) |
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done |
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instance defl :: (bifinite) pcpo |
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by intro_classes (fast intro: defl_minimal) |
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lemma inst_defl_pcpo: "\<bottom> = defl_principal (Abs_fin_defl \<bottom>)" |
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by (rule defl_minimal [THEN UU_I, symmetric]) |
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subsection {* Applying algebraic deflations *} |
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152 |
definition |
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cast :: "'a defl \<rightarrow> 'a \<rightarrow> 'a" |
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where |
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"cast = defl.basis_fun Rep_fin_defl" |
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lemma cast_defl_principal: |
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"cast\<cdot>(defl_principal a) = Rep_fin_defl a" |
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unfolding cast_def |
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apply (rule defl.basis_fun_principal) |
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apply (simp only: below_fin_defl_def) |
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done |
163 |
||
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lemma deflation_cast: "deflation (cast\<cdot>d)" |
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apply (induct d rule: defl.principal_induct) |
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apply (rule adm_subst [OF _ adm_deflation], simp) |
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apply (simp add: cast_defl_principal) |
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apply (rule finite_deflation_imp_deflation) |
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apply (rule finite_deflation_Rep_fin_defl) |
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done |
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lemma finite_deflation_cast: |
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"compact d \<Longrightarrow> finite_deflation (cast\<cdot>d)" |
|
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apply (drule defl.compact_imp_principal, clarify) |
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apply (simp add: cast_defl_principal) |
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apply (rule finite_deflation_Rep_fin_defl) |
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done |
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||
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interpretation cast: deflation "cast\<cdot>d" |
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by (rule deflation_cast) |
181 |
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declare cast.idem [simp] |
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183 |
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lemma compact_cast [simp]: "compact d \<Longrightarrow> compact (cast\<cdot>d)" |
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apply (rule finite_deflation_imp_compact) |
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apply (erule finite_deflation_cast) |
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done |
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188 |
|
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lemma cast_below_cast: "cast\<cdot>A \<sqsubseteq> cast\<cdot>B \<longleftrightarrow> A \<sqsubseteq> B" |
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apply (induct A rule: defl.principal_induct, simp) |
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apply (induct B rule: defl.principal_induct, simp) |
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apply (simp add: cast_defl_principal below_fin_defl_def) |
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done |
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194 |
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lemma compact_cast_iff: "compact (cast\<cdot>d) \<longleftrightarrow> compact d" |
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apply (rule iffI) |
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apply (simp only: compact_def cast_below_cast [symmetric]) |
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apply (erule adm_subst [OF cont_Rep_cfun2]) |
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apply (erule compact_cast) |
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200 |
done |
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|
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lemma cast_below_imp_below: "cast\<cdot>A \<sqsubseteq> cast\<cdot>B \<Longrightarrow> A \<sqsubseteq> B" |
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by (simp only: cast_below_cast) |
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204 |
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lemma cast_eq_imp_eq: "cast\<cdot>A = cast\<cdot>B \<Longrightarrow> A = B" |
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by (simp add: below_antisym cast_below_imp_below) |
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207 |
|
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lemma cast_strict1 [simp]: "cast\<cdot>\<bottom> = \<bottom>" |
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209 |
apply (subst inst_defl_pcpo) |
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210 |
apply (subst cast_defl_principal) |
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211 |
apply (rule Abs_fin_defl_inverse) |
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212 |
apply (simp add: finite_deflation_UU) |
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213 |
done |
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214 |
|
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lemma cast_strict2 [simp]: "cast\<cdot>A\<cdot>\<bottom> = \<bottom>" |
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216 |
by (rule cast.below [THEN UU_I]) |
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217 |
|
27409 | 218 |
end |