\documentclass[a4paper,10pt]{article} \usepackage{amsmath} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{graphicx} \parindent=0in \begin{document} This is an example of the time independent Schrodinger equation with a ramp potential, $V(x) = kx$. Substituing this potential into the S.E. gives $$\frac{d^2\psi(x)}{dx^2}=\frac{2m}{\hbar^2}\left[ kx - E \right] \psi(x)$$ \end{document}