Mon, 15 Jul 2024 12:26:15 +0200 wenzelm clarified signature: more operations;
Thu, 18 Jul 2024 16:00:40 +0200 nipkow merged
Thu, 18 Jul 2024 15:57:07 +0200 nipkow tuned
Thu, 18 Jul 2024 15:17:46 +0200 nipkow added nicer proof
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