Fri, 27 Mar 2020 12:03:20 +0100 wenzelm clarified signature;
Fri, 27 Mar 2020 12:28:05 +0100 nipkow added lemma
Wed, 25 Mar 2020 14:00:23 +0000 paulson merged
Wed, 25 Mar 2020 12:37:57 +0000 paulson updated to more modern style
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