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diff --git a/doc/Eqs/pair_meam_spline.tex b/doc/Eqs/pair_meam_spline.tex
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+\documentclass[12pt]{article}
+
+\begin{document}
+
+$$
+   E=\sum_{ij}\phi(r_{ij})+\sum_{i}U(\rho_{i}),
+$$
+
+$$
+   \rho_{i}=\sum_{j}\rho(r_{ij})+\sum_{jk}f(r_{ij})f(r_{ik})g[\cos(\theta_{jik})]
+$$
+
+\end{document}
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