Fri, 30 Jan 1998 11:32:19 +0100 wenzelm removed dead messy code;
Fri, 30 Jan 1998 11:31:21 +0100 wenzelm added read_var;
Fri, 30 Jan 1998 11:01:49 +0100 wenzelm tuned;
Fri, 23 Jan 1998 13:47:37 +0100 paulson Updated MOD reference
Wed, 21 Jan 1998 15:50:25 +0100 wenzelm added symbols syntax;
Tue, 20 Jan 1998 18:26:26 +0100 wenzelm reorganized into individual theories;
Mon, 19 Jan 1998 16:26:11 +0100 wenzelm tuned;
Mon, 19 Jan 1998 16:25:36 +0100 wenzelm make images;
Thu, 15 Jan 1998 14:16:46 +0100 wenzelm tuned URL;
Thu, 15 Jan 1998 14:15:57 +0100 wenzelm polyml-3.1;
Thu, 15 Jan 1998 13:57:58 +0100 wenzelm obsolete;
Wed, 14 Jan 1998 16:38:04 +0100 mueller added thms wrt weakening and strengthening in Abstraction;
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