An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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linear perturbation theory
  نگره‌ی ِ پرتورش ِ خطی  
negare-ye partureš-e xatti
Fr.: théorie de perturbation linéaire  

Assumption that the variations in the plasma parameters, due to the presence of waves, are small (to the first order) as compared to the undisturbed parameters. This makes it possible to linearize equations by dropping out second order (and higher) nonlinear terms.

See also: → linear; → perturbation; → theory.