2010-09-08 huffman 2010-09-08 use rename_tac to make proof script more robust (with separate set type, 'clarify' yields different variable names)
2010-09-08 haftmann 2010-09-08 modernized primrec
2010-03-01 haftmann 2010-03-01 replaced a couple of constsdefs by definitions (also some old primrecs by modern ones)
2009-10-17 wenzelm 2009-10-17 eliminated hard tabulators, guessing at each author's individual tab-width; tuned headers;
2009-09-21 haftmann 2009-09-21 theory entry point for session Hoare_Parallel (now also with proper underscore)