\documentclass{article}
\usepackage{epsfig}
\pagestyle{empty}
\begin{document}
$Z$
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\[ Z=\frac{\sum_{i=1}^n{\frac{Z_i}{r_i^p}}}{\sum_{i=1}^n{\frac{1}{r_i^p}}} \]
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$Z_i$
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$i$
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$r_i$
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$p$
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$n$
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$w$
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\[ w=\frac{1}{r^p} \]
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\[ Z=\frac{\sum_{i=1}^n{Z_i}}{n} \]
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\[ Z=\min{(Z_1,Z_2,\ldots,Z_n)} \]
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\[ Z=\max{(Z_1,Z_2,\ldots,Z_n)} \]
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\[ Z=\max{(Z_1,Z_2,\ldots,Z_n)}-\min{(Z_1,Z_2,\ldots,Z_n)} \]
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\[ Z=n \]
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\[ Z=\frac{\sum_{i = 1}^n r_i}{n} \]
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\[ Z=\frac{\sum_{i = 1}^{n-1}\sum_{j=i+1}^{n} r_{ij}}{\left(n-1\right)\,n-\frac{n+{\left(n-1\right)}^{2}-1}{2}} \]
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$r_{ij}$
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$j$
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$r$
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$radius_1$
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$x$
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$radius_2$
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$y$
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$angle$
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\end{document}
