Wed, 08 Jul 2015 14:01:40 +0200 haftmann eliminated some duplication
Wed, 08 Jul 2015 14:01:39 +0200 haftmann more algebraic properties for gcd/lcm
Wed, 08 Jul 2015 14:01:34 +0200 haftmann moved normalization and unit_factor into Main HOL corpus
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