Alternative Equation Formats

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MathML

\begin{aligned} \sum_{i = 1}^{n} ψ (e_{i}) x_{i} & = \sum_{i = 1}^{n} w_{i} e_{i} x_{i} = 0 \\ w_{i} & = {\begin{cases} {(1 - {(\frac{e_{i}}{σ k})}^{2})}^{2} & | e_{i} / σ | \leq k \\ 0 & | e_{i} / σ | > k \end{cases} \end{aligned}

Math Rendered as SVG

Math as LaTeX Source

\begin{align*} \sum _{i=1}^{n} \psi (e_ i) \mb{x}_ i & = \sum _{i=1}^{n} w_ i e_ i \mb{x}_ i = \mb{0} \\ w_ i & = \left\{ \begin{array}{ll} \left( 1 - \left(\frac{e_ i}{\sigma k}\right)^2\right)^2 & |e_ i/\sigma | \leq k \cr 0 & |e_ i/\sigma | > k \end{array} \right. \end{align*}