(* Title: HOL/IOA/NTP/Lemmas.thy ID: $Id$ Author: Tobias Nipkow & Konrad Slind *) theory Lemmas imports Main begin subsubsection {* Logic *} lemma neg_flip: "(X = (~ Y)) = ((~X) = Y)" by blast subsection {* Sets *} lemma set_lemmas: "f(x) : (UN x. {f(x)})" "f x y : (UN x y. {f x y})" "!!a. (!x. a ~= f(x)) ==> a ~: (UN x. {f(x)})" "!!a. (!x y. a ~= f x y) ==> a ~: (UN x y. {f x y})" by auto subsection {* Arithmetic *} lemma pred_suc: "0<x ==> (x - 1 = y) = (x = Suc(y))" by (simp add: diff_Suc split add: nat.split) lemmas [simp] = hd_append set_lemmas end