2013-12-25 haftmann 2013-12-25 abolished slightly odd global lattice interpretation for min/max
2013-11-01 haftmann 2013-11-01 more simplification rules on unary and binary minus
2012-11-08 bulwahn 2012-11-08 adjusting proofs as the set_comprehension_pointfree simproc breaks some existing proofs
2012-10-12 wenzelm 2012-10-12 discontinued obsolete typedef (open) syntax;
2012-04-13 wenzelm 2012-04-13 updated headers;
2012-03-17 wenzelm 2012-03-17 renamed HOL-Matrix to HOL-Matrix_LP to avoid name clash with AFP;