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4 commits

Author SHA1 Message Date
Jakob von Raumer
5278f70dea feat(library/lean) add one types as instances of groupoids 2014-12-09 19:12:54 -05:00
Jakob von Raumer
86a38c6c3d feat(library/hott) prove that each group is a contractible groupoid 2014-12-09 19:12:54 -05:00
Jakob von Raumer
f023e4999c feat(library/hott) prove that a groupoid on contractible object type is a group 2014-12-09 19:12:54 -05:00
Jakob von Raumer
7bfd897f9d feat(library/hott) add groupoid definition 2014-12-09 19:12:54 -05:00