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\documentclass{article} \usepackage{amsmath} \usepackage{amssymb} \usepackage{amsfonts} \thispagestyle{empty} \begin{document} \begin{equation} y=N_{0,1}e^{-\frac{x^2}{2\sigma_1^2}}+N_{0,2}e^{-\frac{x^2}{2\sigma_2^2}}\notag \end{equation} \end{document}