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- \documentclass[12pt,a4paper]{article}
- \usepackage[T1]{fontenc}
- \title{p}
- \begin{document}
- $$\frac{\partial \psi}{\partial x} = \frac{\psi_{i+1,j}-\psi_{i,j}}{hx}$$
- $$\frac{\partial \psi}{\partial x} = \frac{\psi_{i,j}-\psi_{i-1,j}}{hx}$$
- $$\frac{\partial \psi}{\partial x} = \frac{\psi_{i+1,j}-\psi_{i-1,j}}{2\cdot hx}$$
-
- \end{document}
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