Orthogonal (series)
= Orthogonal (series)
{wiki=Orthogonal_(series)}
In mathematics, particularly in the fields of functional analysis and Fourier analysis, the term "orthogonal series" refers to a series of functions (or vectors) that are orthogonal to each other in a specified inner product space. 1. **Orthogonality**: Two functions (or vectors) \\( f \\) and \\( g \\) are considered orthogonal if their inner product (which may be defined as an integral, dot product, etc., depending on the context) is zero.