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Reference.org
Trefftz method
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, the Trefftz method is a method for the <a href="/facts/Numerical_analysis/QT9cYa9z">numerical solution</a> of <a href="/facts/Partial_differential_equation/DyPsBlv7">partial differential equations</a> named after the <a href="/facts/Germans/F7mBCrJ4">German</a> mathematician <a href="/facts/Erich_Trefftz/Bex4MJds">Erich Trefftz</a> (1888–1937). It falls within the class of <a href="/facts/Finite_element_method/eUcfP1vn">finite element methods</a>. </p>