Alternative Equation Formats

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MathML

P r (Y = y) = {\begin{cases} ω + (1 - ω) e^{- λ} & for y = 0 \\ (1 - ω) \frac{λ^{y} e^{- λ}}{y!} & for y = 1, 2, \dots \end{cases}

Math Rendered as SVG

Math as LaTeX Source

\[ \mr{Pr}(Y=y) = \left\{ \begin{array}{ll} \omega + (1-\omega )\mr{e}^{-\lambda } & \mbox{for } y=0 \\ (1-\omega )\frac{\lambda ^ y \mr{e}^{-\lambda }}{y!} & \mbox{for } y = 1,2,\ldots \\ \end{array} \right. \]