Zeros of harmonic trinomials with complex parameter
Abstract
In this paper, we study the number of zeros of harmonic trinomials with complex parameter of the form $p_{a}(z)=z^{n}+a\overline{z}^{k}-1,$ $a\in\mathbb{C},n>k,$ and $gcd(n,k)=1.$ We are interested about two problems, first problem about the location of this roots, seconde problem about the number and the location of roots of the harmonic polynomials.Downloads
References
M. A. Brilleslyper and Lisbeth E. Schaubroeck, Locating unimodular roots, College Math. J. 45 (2014), no. 3, 162–168, DOI 10.4169/college.math.j.45.3.162. MR3207562.
M. A. Brilleslyper and Lisbeth E. Schaubroeck, Counting interior roots of trinomials, Math. Mag. 91 (2018), no. 2, 142–150, DOI 10.1080/0025570X.2017.1420332. MR3777918
D. Bshouty, W. Hengartner, and Tiferet Suez, The exact bound on the number of zeros of harmonic polynomials, J. Anal.Math. 67 (1995), 207–218, DOI 10.1007/BF02787790. MR1383494.
D. Khavinson and Grzegorz Swiatek, On the number of zeros of certain harmonic polynomials,Proc. Amer. Math. Soc. 131 (2003), no. 2, 409–414, DOI 10.1090/S0002-9939-02- 06476-6. MR1933331
M. M. Johnson, Book Review: Analytic Geometry by Charles H. Lehmann, Natl. Math. Mag. 17 (1943), no. 6, 280. MR1570119.
O. Lehto and K. I. Virtanen, Quasiconformal mappings in the plane, 2nd ed., Springer-Verlag, New York-Heidelberg, 1973. Translated from the German by K. W. Lucas; Die
Grundlehren der mathematischen Wissenschaften, Band 126. MR0344463
C. Harrat, Zeros of Harmonic Polynomials with Complex Coefficients, Colloquium Mathematicum, Vol. 168 (2022), No. 1, DOI: 10.4064/cm7874-4-2021 .
H. Lewy, On the non-vanishing of the Jacobian in certain one-to-one mappings, Bull. Amer. Math. Soc. 42 (1936), no. 10, 689–692, DOI 10.1090/S0002-9904-1936-06397-4.
MR1563404
A. Melman, Geometry of trinomials, Pacific J. Math. 259 (2012), no. 1, 141–159, DOI 10.2140/pjm.2012.259.141. MR2988487
R. Peretz and J. Schmid, Proceedings of the Ashkelon Workshop on Complex Function Theory, (1996), 203–208, Bar-Ilan Univ., Ramat Gan, 1997.
T. Sheil-Small in Tagesbericht,Mathematisches Forsch. Inst. Oberwolfach, Funktionentheorie, 16-22.2.1992, 19.
A. S. Wilmshurst, The valence of harmonic polynomials, Proc. Amer. Math. Soc. 126 (1998), no. 7, 2077–2081, DOI 10.1090/S0002-9939-98-04315-9. MR1443416.
M. B. Yper, J. Brooks, M. Dorff, R. Howell, and L. Schaubroeck, Zeros of a One-Parameter Family of Harmonic Trinomials, Procceding of the American Mathematical Society, Series B Volume 7, Pages 82–90 (June 17, 2020)
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