# HG changeset patch # User wenzelm # Date 1341500283 -7200 # Node ID 3127f9ce52fb4f9e76507c88eb8cba449d3920fe # Parent 1440a3103af0907de924d355bfd24021c2b41cad removed obsolete rev_contrapos (cf. 1d195de59497); diff -r 1440a3103af0 -r 3127f9ce52fb src/HOL/HOL.thy --- a/src/HOL/HOL.thy Thu Jul 05 16:53:29 2012 +0200 +++ b/src/HOL/HOL.thy Thu Jul 05 16:58:03 2012 +0200 @@ -404,14 +404,6 @@ lemma eq_neq_eq_imp_neq: "[| x = a ; a ~= b; b = y |] ==> x ~= y" by (erule subst, erule ssubst, assumption) -(*still used in HOLCF*) -lemma rev_contrapos: - assumes pq: "P ==> Q" - and nq: "~Q" - shows "~P" -apply (rule nq [THEN contrapos_nn]) -apply (erule pq) -done subsubsection {*Existential quantifier*}