Fri, 12 Jun 2015 08:53:23 +0200 haftmann standardized algebraic conventions: prefer a, b, c over x, y, z
Fri, 12 Jun 2015 08:53:23 +0200 haftmann uniform _ div _ as infix syntax for ring division
Thu, 11 Jun 2015 21:41:55 +0100 paulson fixed several "inside-out" proofs
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