Wed, 19 Oct 2022 15:34:41 +0100 paulson Tidying of old and ugly proofs
Wed, 19 Oct 2022 13:41:42 +0100 paulson deleted unused material
Wed, 19 Oct 2022 13:39:00 +0100 paulson A bit of tidying
Tue, 18 Oct 2022 15:59:15 +0100 paulson merged
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