added missing index
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@@ -148,9 +148,9 @@
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\begin{equation}
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\vec{c} = \frac{1}{k}\sum_{i=1}^{k} \fPos{v_i}
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,\smallskip
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\mat{\Sigma} = \frac{1}{k} \sum_{i=1}^{k} \varphi \cdot \varphi^T
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\mat{\Sigma} = \frac{1}{k} \sum_{i=1}^{k} \varphi_i \varphi_i^T
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,\smallskip
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\varphi = \fPos{v_i}-\vec{c} \enskip.
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\varphi_i = \fPos{v_i}-\vec{c} \smallskip.
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\end{equation}
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%
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For $\mat{\Sigma}$, the two largest eigenvalues $\lambda_1, \lambda_2$ with $\lambda_1 > \lambda_2$
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