Geodesic
On the summability of functions analytic in star-shaped domains
Matematičeskie zametki, Tome 16 (1974) no. 4, pp. 523-528.

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Let $f(z)$ be a function which is analytic over the whole plane except for an arbitrary interval $\Delta$, $0\overline\in\Delta n$. Suppose that $f(z)$ has a power series expansion about the origin. We prove that a matrix exists which sums the power series to $f(z)$ over the whole plane except for $\Delta$. 
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     author = {V. A. Belyaev},
     title = {On the summability of functions analytic in star-shaped domains},
     journal = {Matemati\v{c}eskie zametki},
     pages = {523--528},
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     year = {1974},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_4_a2/}
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V. A. Belyaev. On the summability of functions analytic in star-shaped domains. Matematičeskie zametki, Tome 16 (1974) no. 4, pp. 523-528. http://geodesic.mathdoc.fr/item/MZM_1974_16_4_a2/