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perturbation
perturbation theory
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perturbation theory
per·tur·ba·tion the·o·ry


noun 
Definition:
 
method for obtaining solutions to equations: a method for obtaining approximate solutions to equations for complex physical systems whose behavior is similar to that of a simpler system
Encarta® World English Dictionary [North American Edition] © & (P)2007 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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