Mon, 05 Nov 2018 11:29:11 +0100 wenzelm tuned;
Mon, 05 Nov 2018 10:02:21 +0100 nipkow simplified proof, moved lemma, added lemma
Sun, 04 Nov 2018 17:19:56 +0100 wenzelm more Haskell operations;
Sun, 04 Nov 2018 15:28:51 +0100 wenzelm ported from src/Pure/General/value.ML;
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