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pert
pertain
Perth
Perth and Kinross
pertinacious
pertinent
perturb
perturbation
perturbation theory
pertussis
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Peru Current
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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

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