A groupoid is a category where all morphisms are invertible. This notion can also be seen as an extension of the notion of group. A motivating example is the fundamental groupoid of a topological space with respect to several base points, compared to the usual fundamental group.
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What's a groupoid? What's a good example of a groupoid?What's a groupoid? What's a good example of a groupoid?
What's a groupoid? What's a good example of a groupoid?
What's a groupoid? What's a good example of a groupoid?
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