Definition:Matrix Product (Conventional)/Pre-Multiplication
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Definition
Let $\struct {R, +, \circ}$ be a ring.
Let $\mathbf A = \sqbrk a_{m n}$ be an $m \times n$ matrix over $R$.
Let $\mathbf B = \sqbrk b_{n p}$ be an $n \times p$ matrix over $R$.
Let $\mathbf A \mathbf B$ be the product of $\mathbf A$ with $\mathbf B$.
Then $\mathbf B$ is pre-multiplied by $\mathbf A$.
Also known as
Some sources render it without the hyphen: premultiplication.