src/HOL/Data_Structures/AVL_Set.thy
Tue, 05 May 2020 20:32:57 +0200 nipkow tuned proofs
Tue, 28 Apr 2020 18:34:59 +0200 nipkow use abs(h l - h r) instead of 3 cases, tuned proofs
less more (0) -30 -10 -2 tip