Trivial Group is Abelian
Theorem
The trivial group is an abelian group.
Proof
From Trivial Group is Cyclic Group, it is shown that the algebraic structure $\struct {\set e, \circ}$ such that $e \circ e = e$ is a cyclic group.
The result follows from Cyclic Group is Abelian.
$\blacksquare$