Linked from
The 17 pages that link to Joseph Fourier, each with the reason it gives.
Fourier seriesRelated: His heat theory made the expansion central to mathematical physics.
Heat equationRelated: His 1822 treatise derived and applied the equation to heat conduction.
Joseph-Louis LagrangeRelated: Fourier studied at the École Normale during Lagrange’s tenure there.
Parseval's theoremRelated: Fourier series supplied the setting in which the identity became central.