ディリクレ核
1. Dirichlet kernelIn mathematical analysis, the Dirichlet kernel is the collection of functions It is named after Johann Peter Gustav Lejeune Dirichlet. The importance of the Dirichlet kernel comes from its relation to Fourier series. The convolution of Dn(x) with any function f of period 2π is the nth-degree Fourier series approximation to f, i.e. , we have where is the kth Fourier coefficient of f.
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Read “Dirichlet kernel” on English Wikipedia
Read “ディリクレ核” on Japanese Wikipedia
Read “Dirichlet kernel” on DBpedia
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