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In answering this question, I needed to multiply three matrices - which obviously involves writing them on the same line. I tried a couple of things, none of which worked, so my question is - how do you write collinear matrices?

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It works the same way you did it earlier in the answer, when you had a matrix and vector: just write the markup for the matrices one after another.

$$\begin{pmatrix}...\end{pmatrix}\begin{pmatrix}...\end{pmatrix}\begin{pmatrix}...\end{pmatrix}$$

They don't all have to be on the same line, but as with any other MathJax expression, you can't have a blank line between the starting and ending $$s.

I went ahead and fixed the markup in the answer for you, as an example.

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