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Reordering of lemmas in proper places.
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2008-09-09 Claudio Sacerdoti... Reordering of lemmas in proper places.
2008-09-09 Claudio Sacerdoti... Concrete spaces do form a category, after all :-)
2008-09-03 Claudio Sacerdoti... Setoids are now more pervasive.
2008-08-25 Claudio Sacerdoti... New categories REL and BP.
2008-08-23 Claudio Sacerdoti... Definition of categories.