Abstract
We describe all linear operators on spaces of multivariate polynomials preserving the property of being non-vanishing in open circular domains. This completes the multivariate generalization of the classification program initiated by Pólya–Schur for univariate real polynomials and provides a natural framework for dealing in a uniform way with Lee–Yang type problems in statistical mechanics, combinatorics, and geometric function theory.
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J. Borcea was partially supported by the Swedish Research Council and the Crafoord Foundation. P. Brändén was partially supported by the Göran Gustafsson Foundation.
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Borcea, J., Brändén, P. Lee–Yang Problems and the Geometry of Multivariate Polynomials. Lett Math Phys 86, 53–61 (2008). https://doi.org/10.1007/s11005-008-0271-6
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DOI: https://doi.org/10.1007/s11005-008-0271-6