Wed, 18 Jan 2017 17:56:52 +0100 wenzelm clarified theory name;
Wed, 18 Jan 2017 15:57:00 +0000 paulson New material from Bertrand's postulate (file Bertrand_Discrete_Sqrt), and tidied an old messy proof
Tue, 17 Jan 2017 18:03:59 +0100 nipkow tuned
Tue, 17 Jan 2017 16:11:47 +0100 wenzelm removed some old ASCII syntax;
Tue, 17 Jan 2017 16:11:24 +0100 wenzelm prefer context groups;
Tue, 17 Jan 2017 16:01:52 +0100 wenzelm misc tuning and modernization;
Tue, 17 Jan 2017 15:40:33 +0100 wenzelm prefer context groups;
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