Prelude.thy
author wu
Thu, 27 Jan 2011 17:37:20 +0000
changeset 44 5a7e02dcd3d5
parent 35 d2ddce8b36fd
permissions -rw-r--r--
added a recent paper about reg exps and automata

theory Prelude
imports Main
begin

(*
To make the theory work under Isabelle 2009 and 2011

Isabelle 2009: set_ext
Isabelle 2011: set_eqI

*)


lemma set_eq_intro:
  "(\<And>x. (x \<in> A) = (x \<in> B)) \<Longrightarrow> A = B"
by blast


end