Spectral Method

A numerical technique that represents the solution of a differential problem as a global expansion in basis functions (Fourier, Chebyshev, etc.) and enforces the governing equations in spectral coefficient space or at collocation points, achieving high accuracy for smooth solutions.

An analytical and numerical approach that represents functions or solutions in terms of an operator's spectral basis (eigenfunctions, orthogonal polynomials, Fourier modes) and uses spectral coefficients to solve differential or integral equations, often yielding high-order or exponential convergence for smooth problems.