Houshalter comments on Stupid Questions September 2016 - Less Wrong
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Matrix multiplication
Could somebody explain to me, in a way I'd actually understand, how to (remember how to) go about multiplying a pair of matrixes? I've looked at Wikipedia, I've read linear algebra books up to where they supposedly explain matrixes, and I keep bouncing up against a mental wall where I can't seem to remember how to figure out how to get the answer.
These videos are really good: https://www.khanacademy.org/math/linear-algebra/eola-topic