Alternative Equation Formats

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MathML

i (τ) = - \sum_{j = 1}^{J} p_{j}^{2}

i (τ) = - \sum_{j = 1}^{J} p_{j}^{2}

\begin{equation*} i(\tau )=-\sum _{j=1}^{J}p_ j^2 \end{equation*}