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\overset{!}{=} % overset \underbrace{...}_{\text{...}} % underbrace
matrix
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<- the equation
showed up then disappeared shrinked to be invisible? GitBook doesn't support \newcommand in Math & TeX
\newcommand
% new command \newcommand \x {\times} \newcommand \y {\colorbox{green}{1}} \left( \begin{array}{cccc} \x & \x & \x & \x \\ 0 & \x & \x & \x \\ 0 & 0 & \x & \x \\ 0 & 0 & 0 & \x \\ \y & \y & \y & \y \\ \end{array} \right)
% test `\newcommand` \newcommand \x {\times} \newcommand \y {\colorbox{green}{1}} \left( \begin{array}{cccc} \x & \x & \x & \x \\ 0 & \x & \x & \x \\ 0 & 0 & \x & \x \\ 0 & 0 & 0 & \x \\ \y & \y & \y & \y \\ \end{array} \right)