perturbation theory(redirected from Perturbation (mathematics))
Also found in: Dictionary.
perturbation theory[‚pər·tər′bā·shən ‚thē·ə·rē]
The study of the solutions of differential and partial differential equations from the viewpoint of perturbation of solutions.
The theory of obtaining approximate solutions to the equations of motion of a physical system when these equations differ by a small amount from equations which can be solved exactly.