Mon, 25 Nov 2019 10:58:15 +0100 wenzelm avoid vacuous session Pure -- dump does not read_pure_theory;
Sun, 24 Nov 2019 22:54:42 +0100 wenzelm updated to polyml-5.8.1-20191113 test version (Poly/ML 055f20cdc326);
Sun, 24 Nov 2019 15:45:32 +0100 wenzelm clarified vacuous selection vs. Pure;
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