Alternative Equation Formats

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MathML

\begin{aligned} Pr (Y = y) & = π p_{1} + (1 - π) p_{2} (y, μ) \\ p_{1} & = {\begin{cases} 1 & y = 0 \\ 0 & o t h e r w i s e \end{cases} \end{aligned}

MathML rendered with MathJax

\begin{aligned} Pr (Y = y) & = π p_{1} + (1 - π) p_{2} (y, μ) \\ p_{1} & = {\begin{cases} 1 & y = 0 \\ 0 & o t h e r w i s e \end{cases} \end{aligned}

Math as LaTeX Source

\begin{align*} \Pr (Y=y) & = \pi p_1 + (1-\pi ) p_2(y,\mu ) \\ p_1 & = \left\{ \begin{array}{ll} 1 & y=0 \cr 0 & \mr{otherwise} \end{array} \right. \\ \end{align*}