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Hausdorff-summability of power series i
Authors:Rolf Trautner
Affiliation:(1) Abteilung für Mathematik I der Universität, Blaubeurer Straße 30, 79 Ulm
Abstract:Let A be a regular summability method and P(w)=Sgrakwk a power series with positive radius of convergence. A theorem of Okada states, that P(w) is summable (A) for w in the region, where MP is the Mittag-Leffler-star of P and RAprime is the largest star-shaped open region, such that Sgrwk is uniformly summable (A) on each of its compact subsets. The question remains open, whether P(w) might be summable (A) when w is outside of the closure
$$overline G $$
of G. In this paper the question is answered for the class of Hausdorff methods.
Keywords:
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