Linear operators on polynomials preserving roots in open circular domains
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- by Eugeny Melamud PDF
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Abstract:
In the present paper we answer a question raised by J. Borcea and P. Brändén and give a description of the class of operators preserving roots in open circular domains, i.e., in images of the open upper half-plane under the Möbius transformations. Our second result is a description of the difference between $\mathcal A(G)$ (the class of operators preserving roots in an open set $G$) and $\mathcal A(\overline G)$ (the class of operators preserving roots in $\overline {G}$).References
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Additional Information
- Eugeny Melamud
- Affiliation: Department of Mathematics and Mechanics, St. Petersburg State University, 28, Universitetskii pr., St. Petersburg, 198504, Russia
- Email: eugeny.melamud@comapping.com
- Received by editor(s): November 30, 2011
- Received by editor(s) in revised form: December 1, 2012
- Published electronically: August 12, 2015
- Communicated by: Richard Rochberg
- © Copyright 2015 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 143 (2015), 5213-5218
- MSC (2010): Primary 30C15; Secondary 32A60, 47B38
- DOI: https://doi.org/10.1090/proc/12109
- MathSciNet review: 3411138