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Reference.org
Oscillatory integral
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<p>In <a href="/facts/Mathematical_analysis/XXeR26Ih">mathematical analysis</a> an oscillatory integral is a type of <a href="/facts/Distribution_(mathematics)/yfaJ4mUp">distribution</a>. Oscillatory integrals make rigorous many arguments that, on a naive level, appear to use divergent integrals. It is possible to represent approximate solution operators for many differential equations as oscillatory integrals. </p>