Sun, 14 Jan 2018 15:17:51 +0100 wenzelm clarified SML (no formal comments) vs. Isabelle/ML (arbitrary comments);
Sun, 14 Jan 2018 15:06:27 +0100 wenzelm clarified signature;
Sun, 14 Jan 2018 14:11:02 +0100 wenzelm clarified modules: uniform notion of formal comments;
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