フェイェール核
1. Fejér kernelIn mathematics, the Fejér kernel is used to express the effect of Cesàro summation on Fourier series. It is a non-negative kernel, giving rise to an approximate identity. The Fejér kernel is defined as where is the kth order Dirichlet kernel. It can also be written in a closed form as, where this expression is defined. It is named after the Hungarian mathematician Lipót Fejér (1880–1959). The important property of the Fejér kernel is .
Read “Fejér kernel” on English Wikipedia
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Read “Fejér kernel” on English Wikipedia
Read “フェイェール核” on Japanese Wikipedia
Read “Fejér kernel” on DBpedia
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