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## LaTex error

1. Hi! This piece of LaTex code: $latex \begin{bmatrix} {\lambda}_1 & 0 & 0 & 0 \\ 0 & {\lambda}_2 & 0 & 0 \end{bmatrix}$ is not parsing correctly. It uses 'amsmath' package which seems to be automatically supported by WP.com, or is it?

The blog I need help with is amitksaha.wordpress.com.

2. This is really getting crazy now. Some of my math formulaes compile fine with \$latex but, WordPress shows parsing errors.