Mon, 26 Jun 2017 11:07:48 +0200 clarified indentation;
wenzelm [Mon, 26 Jun 2017 11:07:48 +0200] rev 66194
clarified indentation;
Mon, 26 Jun 2017 16:59:44 +0100 More tidying of horrible proofs
paulson <lp15@cam.ac.uk> [Mon, 26 Jun 2017 16:59:44 +0100] rev 66193
More tidying of horrible proofs
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