Thu, 03 Feb 1994 13:56:15 +0100 wenzelm added if_none, parents, commas, gen_duplicates, duplicates, assoc2;
Thu, 03 Feb 1994 13:55:42 +0100 wenzelm replaced pprint_sg by Sign.pprint_sg;
Thu, 03 Feb 1994 13:55:20 +0100 wenzelm replaced eq_sg by Sign.eq_sg;
Thu, 03 Feb 1994 13:55:03 +0100 wenzelm removed eq_sg, pprint_sg, print_sg (now in sign.ML);
Thu, 03 Feb 1994 13:53:44 +0100 wenzelm major cleanup;
Thu, 03 Feb 1994 13:53:08 +0100 wenzelm extend_theory: changed type of "abbrs" arg;
Wed, 02 Feb 1994 11:15:22 +0100 clasohm made error message "file not found" more informative
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