2010-09-07 nipkow 2010-09-07 expand_fun_eq -> ext_iff expand_set_eq -> set_ext_iff Naming in line now with multisets
2010-06-28 haftmann 2010-06-28 merged constants "split" and "prod_case"
2010-06-18 haftmann 2010-06-18 prefer fold over foldl
2010-04-16 wenzelm 2010-04-16 replaced generic 'hide' command by more conventional 'hide_class', 'hide_type', 'hide_const', 'hide_fact' -- frees some popular keywords;
2010-04-15 haftmann 2010-04-15 theory RBT with abstract type of red-black trees backed by implementation RBT_Impl