Wed, 04 Jan 2023 14:35:19 +0100 wenzelm clarified signature: old node is ignored;
Wed, 04 Jan 2023 14:26:30 +0100 wenzelm tuned;
Wed, 04 Jan 2023 13:39:40 +0100 wenzelm clarified signature;
Wed, 04 Jan 2023 19:06:16 +0000 paulson final tidying of theorems
Wed, 04 Jan 2023 17:46:27 +0000 paulson merged
Wed, 04 Jan 2023 10:27:32 +0000 paulson merged
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