I know I can use bmatrix
in MathJax, but for vector the syntax looks a bit verbose. Isn't there a more compact way for inputing just vectors than writing:
$\left(\begin{bmatrix} 1 \cr 3 \end{bmatrix} - \begin{bmatrix} 2 \cr 2 \end{bmatrix} \right) \cdot \begin{bmatrix} 4 \cr 4 \end{bmatrix} =0$
\cr
is not latex syntax, it should be\\
\\
but it's still incorrect even though it happens to typeset without error) . It is not clear whether you want a more compact output (eg from smallmatrix or shortstack) or whether you just want a less verbose markup (you could define a llocal command)smallmatrix
env is supported my mathjax though)