Perturbation Theory

A calculus approach to approximate solutions to problems. Build a simpler model that approximates a complex model, and split the solution into "solvable" and "perturbative" parts. In regular perturbation theory, this is a split into terms in a power series: \(A \equiv A_0 + \varepsilon\A_1 + \varepsilon^{2}A_2 ...\)

Originally created to solve the three-body problem.