Galerkin Method -- from Wolfram MathWorld
https://mathworld.wolfram.com/GalerkinMethod.html17.12.2021 · A method of determining coefficients alpha_k in a power series solution y(x)=y_0(x)+sum_(k=1)^nalpha_ky_k(x) of the ordinary differential equation L^~[y(x)]=0 so that L^~[y(x)], the result of applying the ordinary differential operator to y(x), is orthogonal to every y_k(x) for k=1, ..., n (Itô 1980). Galerkin methods are equally ubiquitous in the solution of partial …
Galerkin method - Wikipedia
https://en.wikipedia.org/wiki/Galerkin_methodIn mathematics, in the area of numerical analysis, Galerkin methods, named after the Russian mathematician Boris Galerkin, convert a continuous operator problem, such as a differential equation, commonly in a weak formulation, to a discrete problem by applying linear constraints determined by finite sets of basis functions.