So as I'm preparing for finals, I'm wondering:(adsbygoogle = window.adsbygoogle || []).push({});

The multiplication of two matrices is only defined under special circumstances regarding the dimensions of the matrices.

Doesn't that require that compositions of linear transformations are only defined in the same circumstances? I can't imagine not being able to not define a composition of linear transformations, can someone demonstrate this?

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# Very basic linear algebra question

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