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Mergelyan's approximation theorem with nonvanishing polynomials and universality of zeta-functions
Department of Mathematics, Stockholm University, Stockholm, Sweden.ORCID iD: 0000-0002-9651-1766
2013 (English)In: Journal of Approximation Theory, ISSN 0021-9045, E-ISSN 1096-0430, Vol. 167, p. 201-210Article in journal (Refereed) Published
Abstract [en]

We prove a variant of the Mergelyan approximation theorem that allows us to approximate functions that are analytic and nonvanishing in the interior of a compact set K with connected complement, and whose interior is a Jordan domain, with nonvanishing polynomials. This result was proved earlier by the author in the case of a compact set K without interior points, and independently by Gauthier for this case and the case of strictly starlike compact sets. We apply this result on the Voronin universality theorem for compact sets K, where the usual condition that the function is nonvanishing on the boundary can be removed. We conjecture that this version of Mergelyan's theorem might be true for a general set K with connected complement and show that this conjecture is equivalent to a corresponding conjecture on Voronin Universality.

Place, publisher, year, edition, pages
Academic Press, 2013. Vol. 167, p. 201-210
Keywords [en]
Mergelyan's Theorem, Voronin universality, Polynomial approximation
National Category
Mathematical Analysis
Identifiers
URN: urn:nbn:se:oru:diva-79186DOI: 10.1016/j.jat.2012.12.005ISI: 000314555800010Scopus ID: 2-s2.0-84872408619OAI: oai:DiVA.org:oru-79186DiVA, id: diva2:1450092
Available from: 2020-06-30 Created: 2020-06-30 Last updated: 2020-08-04Bibliographically approved

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Andersson, Johan

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