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Fejér kernel : ウィキペディア英語版 | Fejér kernel In mathematics, the Fejér kernel is a summability kernel used to express the effect of Cesàro summation on Fourier series. It is a non-negative kernel, giving rise to an approximate identity. It is named after the Hungarian mathematician Lipót Fejér (1880–1959). ==Definition== The Fejér kernel is defined as : where : is the ''k''th order Dirichlet kernel. It can also be written in a closed form as :, where this expression is defined. The Fejér kernel can also be expressed as :.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Fejér kernel」の詳細全文を読む
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