Wed, 27 Aug 2008 01:27:33 +0200 huffman add lemmas about Rats similar to those about Reals
Tue, 26 Aug 2008 23:49:46 +0200 huffman move real_vector class proofs into vector_space and group_hom locales
Tue, 26 Aug 2008 18:59:52 +0200 krauss added distributivity of relation composition over union [simp]
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