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Fuchsian differential equation

\documentclass{article}
% this is the default PlanetMath preamble.  as your knowledge
% of TeX increases, you will probably want to edit this, but
% it should be fine as is for beginners.

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\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}

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%\usepackage{psfrag}
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%\usepackage{graphicx}
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%\usepackage{amsthm}
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\begin{document}
A linear ordinary differential equation is called Fuchsian if every singular point, including infinity is \PMlinkname{regular}{FuchsianSingularity}.  The form of such an equation is rather restricted.  The coefficients of the equation must be rational functions.
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