Cesaro Summability of Fourier Series and Its Consequences
Part of the Graduate Texts in Mathematics book series (GTM, volume 64)
From 3.2.2 and the fact that the Fejér kernels FN form an approximate identity (see 5.1.1), we infer at once the following basic results about uniform nd mean summability of Fourier series.
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© Springer-Verlag New York, Inc. 1979