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Reference.org
Operational calculus
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<p>Operational calculus, also known as operational analysis, is a technique by which problems in <a href="/facts/Mathematical_Analysis/XXeR26Ih">analysis</a>, in particular <a href="/facts/Differential_equation/9MGbE3Ca">differential equations</a>, are transformed into algebraic problems, usually the problem of solving a <a href="/facts/Polynomial_equation/1QauIGxs">polynomial equation</a>. </p>