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If $$A$$ is $$m \times p$$ and $$B$$ is $$p \times n$$, product $$AB$$ is $$m \times n$$.
Element $$(AB)_{ij} = \sum_{k=1}^{p} a_{ik} b_{kj}$$.
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If $$A$$ is $$m \times p$$ and $$B$$ is $$p \times n$$, product $$AB$$ is $$m \times n$$.
Element $$(AB)_{ij} = \sum_{k=1}^{p} a_{ik} b_{kj}$$.
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