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Re:The Philosophy of Linear Algebra (2021) by jethkl on Monday June 13, 2022 @07:25AM (#31723906)
> Matrix multiplication is the composition of linear maps.

This is an insight due to Cayley (see @ogogmad's comment, [1], and [2]).

> If your professor...

My professor provided historical context.

[1] https://abel.math.harvard.edu/~knill/history/matrix/index.ht...

[2] https://ia802808.us.archive.org/0/items/philtrans05474612/05...

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