Mon, 20 Mar 2023 15:02:17 +0100 desharna refactored proofs
Mon, 20 Mar 2023 15:01:59 +0100 desharna added lemmas Finite_Set.bex_min_element and Finite_Set.bex_max_element
Mon, 20 Mar 2023 15:01:12 +0100 desharna reversed import dependency between Relation and Finite_Set; and move theorems around
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