groupoid (Q1196038)
category where every morphism is invertible; generalization of a group
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other details
aliases Brandt groupoid
 virtual group
description category where every morphism is invertible; generalization of a group

External Links
(P646) /m/0395f
(P1036) 512.28
(P2812) Groupoid
(P4215) groupoid
(P6366) 34751157
(P7726) Groupoids
(P10376) mathematics/groupoids