Perturbation theory

pictorial representations of the behavior of subatomic particles

mathematical methods used to find an approximate solution to a problem which cannot be solved exactly

quantum mechanics

formula that describes the transition rate from one energy eigenstate of a quantum system into other energy eigenstates

summation method for divergent series

technique used to approximate integrals

scattering theory

basic principle of asymptotic analysis due to George Gabriel Stokes and Lord Kelvin

expressions for approximation accuracy

in physics

Mathematical technique

A mathematic operator acting on a given space of sequences

extension of Laplace's method for approximating integrals