. "harmonic analysis"@en-us . "0"^^ . . . . . "analysis of a periodic function into a sum of simple sinusoidal components"@en-us . . "06014278-n"^^ . "Fourier analysis"^^ . "0"^^ . . . "106014278"^^ . "104604673"@en-us . . . "Fourier analysis"@en-us . "105658911"@en-us .