Alternative Equation Formats

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MathML

I_{k} = \sum_{j = 1}^{t_{k}} \frac{r_{a k j} r_{b k j} d_{k j}}{r_{k j}^{2}}

I_{k} = \sum_{j = 1}^{t_{k}} \frac{r_{a k j} r_{b k j} d_{k j}}{r_{k j}^{2}}

\[ I_{k} = \sum _{j=1}^{t_{k}} \frac{ r_{akj} \, r_{bkj} \, d_{kj} }{r_{kj}^{2}} \]