author | traytel |
Tue, 01 Oct 2013 17:06:35 +0200 | |
changeset 54014 | 21dac9a60f0c |
parent 53355 | 603e6e97c391 |
child 55070 | 235c7661a96b |
permissions | -rw-r--r-- |
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(* Title: HOL/BNF/Examples/Lambda_Term.thy |
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Author: Dmitriy Traytel, TU Muenchen |
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Author: Andrei Popescu, TU Muenchen |
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Copyright 2012 |
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Lambda-terms. |
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*) |
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header {* Lambda-Terms *} |
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theory Lambda_Term |
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imports "../BNF" |
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begin |
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section {* Datatype definition *} |
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datatype_new 'a trm = |
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Var 'a | |
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App "'a trm" "'a trm" | |
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Lam 'a "'a trm" | |
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Lt "('a \<times> 'a trm) fset" "'a trm" |
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subsection{* Example: The set of all variables varsOf and free variables fvarsOf of a term: *} |
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primrec_new varsOf :: "'a trm \<Rightarrow> 'a set" where |
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"varsOf (Var a) = {a}" |
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| "varsOf (App f x) = varsOf f \<union> varsOf x" |
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| "varsOf (Lam x b) = {x} \<union> varsOf b" |
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| "varsOf (Lt F t) = varsOf t \<union> (\<Union> { {x} \<union> X | x X. (x,X) |\<in>| fimage (map_pair id varsOf) F})" |
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primrec_new fvarsOf :: "'a trm \<Rightarrow> 'a set" where |
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"fvarsOf (Var x) = {x}" |
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| "fvarsOf (App t1 t2) = fvarsOf t1 \<union> fvarsOf t2" |
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| "fvarsOf (Lam x t) = fvarsOf t - {x}" |
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| "fvarsOf (Lt xts t) = fvarsOf t - {x | x X. (x,X) |\<in>| fimage (map_pair id varsOf) xts} \<union> |
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(\<Union> {X | x X. (x,X) |\<in>| fimage (map_pair id varsOf) xts})" |
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lemma diff_Un_incl_triv: "\<lbrakk>A \<subseteq> D; C \<subseteq> E\<rbrakk> \<Longrightarrow> A - B \<union> C \<subseteq> D \<union> E" by blast |
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lemma in_fmap_map_pair_fset_iff[simp]: |
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"(x, y) |\<in>| fimage (map_pair f g) xts \<longleftrightarrow> (\<exists> t1 t2. (t1, t2) |\<in>| xts \<and> x = f t1 \<and> y = g t2)" |
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by force |
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lemma fvarsOf_varsOf: "fvarsOf t \<subseteq> varsOf t" |
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proof induct |
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case (Lt xts t) thus ?case unfolding fvarsOf.simps varsOf.simps by (elim diff_Un_incl_triv) auto |
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qed auto |
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end |