Fejér kernel Guide, Meaning , Facts, Information and Description

In mathematics, the Fejér kernel is used to express the effect of Cesàro summation on Fourier series. It is a positive kernel, giving rise to an approximate identity.

The Fejer kernel is defined as

,

where

is the nth order Dirichlet kernel. It is named for the Hungarian mathematician Lipót Fejér (1880–1959).

See also

• Gibbs phenomenon

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