Commutative
Let \(A\) be a set . We call a binary operation \(\ast: A \times A \rightarrow A\) commutative if for every \(a,b \in A\):
\[ a \ast b=b \ast a \]Let \(A\) be a set . We call a binary operation \(\ast: A \times A \rightarrow A\) commutative if for every \(a,b \in A\):
\[ a \ast b=b \ast a \]