Alternative Equation Formats

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MathML

\begin{aligned} a_{i} & = \sum_{j = 1}^{p} {[A_{i + p}]}_{j j} \end{aligned}

\begin{align*} \mb{a}_ i & = \sum ^{p}_{j=1}\left[\mb{A}_{i+p}\right]_{jj} \end{align*}