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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$\begingroup$ More on LaTeX: meta.physics.stackexchange.com/q/136/2451 , meta.physics.stackexchange.com/q/804/2451 , meta.math.stackexchange.com/q/5020/11127 , meta.stackexchange.com/q/68388 and links therein. $\endgroup$ – Qmechanic♦ Jan 25 '15 at 21:45
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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.
