Example 4.2.6. A group G gives rise to a groupoid with a single object x and morphisms \mathop{\mathrm{Mor}}\nolimits (x, x) = G, with the composition rule given by the group law in G. Every groupoid with a single object is of this form.
Example 4.2.6. A group G gives rise to a groupoid with a single object x and morphisms \mathop{\mathrm{Mor}}\nolimits (x, x) = G, with the composition rule given by the group law in G. Every groupoid with a single object is of this form.
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