An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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perturbation method
  روش ِ پرتورش  
raveš-e partureš
Fr.: méthode de perturbation  

Approximate method of solving a difficult problem if the equations to be solved depart only slightly from those of a problem already solved.

See also: → perturbation; → method.