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I wanted to make the title: 'When is Matrix Multiplication Well-Defined', but the software wouldn't let me.

If we have two matrices $A$ and $B$, then $AB$ is well defined if and only if the number of columns of $A$ equals the number of rows of $B$.

Is this right?

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    Yes, that’s exactly right.2012-12-08
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    Great, thanks a lot!2012-12-08
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    My pleasure. $\,$2012-12-08

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