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Reference.org
Separation of variables
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, separation of variables (also known as the Fourier method) is any of several methods for solving <a href="/facts/Ordinary_differential_equation/ygKGQ8kD">ordinary</a> and <a href="/facts/Partial_differential_equation/DyPsBlv7">partial differential equations</a>, in which algebra allows one to rewrite an equation so that each of two variables occurs on a different side of the equation. </p>