Fourier-support almost orthogonality
= Fourier-support almost orthogonality
Functions with pairwise disjoint, or uniformly finitely overlapping, Fourier supports are almost orthogonal in $L^2$ by the <Plancherel theorem>.
= Fourier-support almost orthogonality
Functions with pairwise disjoint, or uniformly finitely overlapping, Fourier supports are almost orthogonal in $L^2$ by the <Plancherel theorem>.