src/HOL/Data_Structures/AVL_Set.thy
2016-07-07 nipkow 2016-07-07 got rid of class cmp; added height-size proofs by Daniel Stuewe
2016-03-06 nipkow 2016-03-06 tuned
2015-11-15 nipkow 2015-11-15 tuned white space
2015-11-13 nipkow 2015-11-13 tuned
2015-11-05 nipkow 2015-11-05 tuned
2015-11-05 nipkow 2015-11-05 Convertd to 3-way comparisons
2015-10-13 nipkow 2015-10-13 added invar empty
2015-09-23 nipkow 2015-09-23 added AVL and lookup function