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  1. The category group is a category with one object and all morphisms invertible... Hmmm
    # https://indy.im/attachment/17115

    Saturday, 21-Apr-18 13:38:32 UTC from indy.im
    1. "A group is a category with one object and all morphisms invertible" is what I understand now.

      Saturday, 21-Apr-18 20:32:59 UTC from indy.im