Alternative Equation Formats

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MathML

\begin{aligned} E [Y] = & X β \\ V a r [Y] = & σ^{2} I \Leftrightarrow C o v [Y_{i}, Y_{j}] = {\begin{cases} σ^{2} & i = j \\ 0 & otherwise \end{cases} \end{aligned}

Math Rendered as SVG

Math as LaTeX Source

\begin{align*} \mr{E}[\bY ] =& \, \, \bX \bbeta \\ \mr{Var}[\bY ] =& \, \, \sigma ^2\bI \Leftrightarrow \mr{Cov}[Y_ i,Y_ j] = \left\{ \begin{array}{ll} \sigma ^2 & i = j \cr 0 & \mbox{otherwise} \end{array} \right. \end{align*}