Abstract
LetD be a domain in ℝn (n≥1) andx 0 ∈D. We prove that a necessary and sufficient condition for the existence of a semicontinuous regular methodA such that the series expansion of any real-analytic functionf inD in homogeneous polynomials aroundx 0 is uniformly summed by this method tof(x) on compact subsets ofD is thatD be rectilinearly star-shaped with respect tox 0.
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Translated fromMatematicheskie Zametki, Vol. 60, No. 5, pp. 708–714, November, 1996.
In conclusion, I wish to my sincere gratitude to my scientific supervisor Prof. Dolzhenko for setting the problem and his attention to my work.
This research was supported by the Russian Foundation for Basic Research under grant No. 93-01-00236 and by the International Science Foundation under grant No. NCF000.
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Pokrovskii, A.V. Analytic continuation and superconvergence of series of homogeneous polynomials. Math Notes 60, 531–535 (1996). https://doi.org/10.1007/BF02309167
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DOI: https://doi.org/10.1007/BF02309167