Wed, 11 Nov 2020 20:58:36 +0100 wenzelm more operations;
Wed, 11 Nov 2020 20:55:25 +0100 wenzelm more operations (as in Isabelle/ML);
Tue, 10 Nov 2020 12:48:56 +0100 wenzelm tuned signature;
Tue, 10 Nov 2020 12:45:20 +0100 wenzelm tuned;
Wed, 11 Nov 2020 14:27:17 +0000 paulson mult_le_cancel_iff1, mult_le_cancel_iff2, mult_less_iff1 generalised from the real_ versions
Wed, 11 Nov 2020 11:27:44 +0000 paulson merged
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