# HG changeset patch # User paulson # Date 865844465 -7200 # Node ID 05b397185e1d66ed91aab0c93b399069a8734eff # Parent d21b920363abfb038d504c1a0367715d64a51efc Useful new lemma diff -r d21b920363ab -r 05b397185e1d src/HOL/Auth/Message.ML --- a/src/HOL/Auth/Message.ML Fri Jun 06 21:49:47 1997 +0200 +++ b/src/HOL/Auth/Message.ML Mon Jun 09 10:21:05 1997 +0200 @@ -477,6 +477,10 @@ "!!H. Y: analz (insert X H) ==> X: analz H --> Y: analz H" *) +goal thy "!!H. X: analz H ==> analz (insert X H) = analz H"; +by (blast_tac (!claset addIs [analz_cut, analz_insertI]) 1); +qed "analz_insert_eq"; + (** A congruence rule for "analz" **)