Mon, 18 Dec 2023 21:31:39 +0100 wenzelm tuned;
Mon, 18 Dec 2023 14:42:41 +0100 wenzelm clarified signature, following Term.subst_bounds_same;
Mon, 18 Dec 2023 14:35:11 +0100 wenzelm tuned whitespace;
Mon, 18 Dec 2023 12:57:59 +0100 wenzelm minor performance tuning: more concise union;
Mon, 18 Dec 2023 12:02:58 +0100 wenzelm tuned comments;
Mon, 18 Dec 2023 11:19:15 +0100 wenzelm tuned, following close_proof;
Mon, 18 Dec 2023 11:15:22 +0100 wenzelm proper treatment of proof hyps, following 8368160d3c65;
Sun, 17 Dec 2023 22:58:32 +0100 wenzelm proper treatment of proof hyps: unchangeable, like bound;
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