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The Converse of Abel's Theorem on Power Series
1911
Proceedings of the London Mathematical Society
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O.S.," p. 3 i i . t This generalised method of summation is due to Riesz, Comptes Rendus, July 5th, 1909. Cesaro's first mean has 1 in place of fin: if this mean exists we say that 2a» is summable (Cl). The notation (Cr), R (r, fi n ) was introduced by Hardy.
doi:10.1112/plms/s2-9.1.434
fatcat:nq3wt62fpfhn5jmikouz4e5lri