Trivial Group is Smallest Group
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Theorem
Let $G = \struct {\set e, \circ}$ be a trivial group.
Then $G$ is the smallest group possible, in that there exists no set with lower cardinality which is the underlying set of a group.
Proof
From Trivial Group is Group, we have that there does exist a group of cardinality $1$.
From Group is not Empty, there can be no group of smaller order.
$\blacksquare$
Sources
- 1983: François Le Lionnais and Jean Brette: Les Nombres Remarquables ... (previous) ... (next): $1$