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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