Abstract
The non-negativity on the unit disk of the real part of the polar derivative of a polynomial is proved via an integral representation with a positive kernel, or as a consequence of a weighted sum of hermitian squares decomposition.
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Putinar, M., Shimorin, S. (2019). Positive Integral Kernels for Polar Derivatives. In: Aleman, A., Hedenmalm, H., Khavinson, D., Putinar, M. (eds) Analysis of Operators on Function Spaces. Trends in Mathematics. Birkhäuser, Cham. https://doi.org/10.1007/978-3-030-14640-5_10
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DOI: https://doi.org/10.1007/978-3-030-14640-5_10
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