Powers of Commutative Elements in Monoids
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Theorem
These results are an extension of the results in Powers of Commutative Elements in Semigroups in which the domain of the indices is extended to include all integers.
Let $\left ({S, \circ}\right)$ be a monoid whose identity is $e_S$.
Let $a, b \in S$ be invertible elements for $\circ$ that also commute.
Then the following results hold.
Commutativity of Powers
- $\forall m, n \in \Z: a^m \circ b^n = b^n \circ a^m$
Product of Commutative Elements
- $\forall n \in \Z: \paren {a \circ b}^n = a^n \circ b^n$