# Definition:Commutative B-Algebra

## Definition

Let $\struct {X, \circ}$ be a $B$-algebra.

Then $\struct {X, \circ}$ is said to be $0$-commutative (or just commutative) if and only if:

$\forall x, y \in X: x \circ (0 \circ y) = y \circ (0 \circ x)$

## Note

Note the independent properties of $\struct {X, \circ}$ being $0$-commutative and $\circ$ being commutative.

To demonstrate consider the $B$-algebra $\struct {\R, -}$ where $-$ denotes real subtraction.

$\struct {\R, -}$ is 0-commutative but $-$ is not commutative.