{{Short description|Russian mathematician (born 1950)}} [[File:Gusein-zade.jpg|thumb|Sabir Gusein-Zade (2010), El Escorial]]

'''Sabir Medgidovich Gusein-Zade''' ({{langx|ru|Сабир Меджидович Гусейн-Заде}}; born 29 July 1950 in [[Moscow]]<ref name="HP">[https://www.mccme.ru/~sabir/ Home page of Sabir Gusein-Zade]</ref>) is a [[Russians|Russian]] mathematician and a specialist in [[singularity theory]] and its applications.<ref name="MMJ">{{citation | last1 = Artemov | first1 = S. B. | last2 = Belavin | first2 = A. A. | last3 = Buchstaber | first3 = V. M. | last4 = Esterov | first4 = A. I. | last5 = Feigin | first5 = B. L. | last6 = Ginzburg | first6 = V. A. | last7 = Gorsky | first7 = E. A. | last8 = Ilyashenko | first8 = Yu. S. | last9 = Kirillov | first9 = A. A. | last10 = Khovanskii | first10 = A. G. | last11 = Lando | first11 = S. K. | last12 = Margulis | first12 = G. A. | last13 = Neretin | first13 = Yu. A. | last14 = Novikov | first14 = S. P. | last15 = Shlosman | first15 = S. B. | last16 = Sossinsky | first16 = A. B. | last17 = Tsfasman | first17 = M. A. | last18 = Varchenko | first18 = A. N. | last19 = Vassiliev | first19 = V. A. | last20 = Vlăduţ | first20 = S. G. | issue = 4 | journal = [[Moscow Mathematical Journal]] | title = Sabir Medgidovich Gusein-Zade | url = http://www.ams.org/distribution/mmj/vol10-4-2010/gusein-zade.html | volume = 10 | year = 2010}}.</ref>

He studied at [[Moscow State University]], where he earned his Ph.D. in 1975 under the joint supervision of [[Sergei Novikov (mathematician)|Sergei Novikov]] and [[Vladimir Arnold]].<ref name="MGP">{{mathgenealogy|id=55263}}</ref> Before entering the university, he had earned a [[gold medal]] at the [[International Mathematical Olympiad]].<ref name="MMJ" />

Gusein-Zade co-authored with V. I. Arnold and [[Alexander Varchenko|A. N. Varchenko]] the textbook ''Singularities of Differentiable Maps'' (published in English by [[Birkhäuser]]).<ref name="MMJ" />

A professor in both the Moscow State University and the [[Independent University of Moscow]], Gusein-Zade also serves as co-editor-in-chief for the ''[[Moscow Mathematical Journal]]''.<ref>{{citation|url=http://static.bsu.az/w24/sabir%20huseinzade60.pdf|journal=TWMS Journal of Pure and Applied Mathematics|volume=2|issue=1|year=2011|page=161|department=Anniversaries|title=Sabir Gusein-Zade – 60|author=Editorial Board}}.</ref> He shares credit with [[Norbert A'Campo]] for results on the singularities of plane curves.<ref>{{citation | last = Wall | first = C. T. C. | author-link = C. T. C. Wall | doi = 10.1017/CBO9780511617560 | isbn = 978-0-521-83904-4 | mr = 2107253 | quote = An important result, due independently to A'Campo and Gusein-Zade, asserts that every plane curve singularity is equisingular to one defined over <math>\mathbb R</math> and admitting a real morsification <math>f_t</math> with only 3 critical values | page = 152 | publisher = Cambridge University Press, Cambridge | series = London Mathematical Society Student Texts | title = Singular Points of Plane Curves | url = https://books.google.com/books?id=8kjDbkf2iHUC&pg=PA152 | volume = 63 | year = 2004}}.</ref><ref>{{citation | last1 = Brieskorn | first1 = Egbert | author1-link = Egbert Brieskorn | last2 = Knörrer | first2 = Horst |author2-link=Horst Knörrer | doi = 10.1007/978-3-0348-5097-1 | isbn = 978-3-0348-0492-9 | location = Basel | mr = 2975988 | quote = I would have liked to introduce the beautiful results of A'Campo and Gusein-Zade on the computation of the monodromy groups of plane curves | page = vii | publisher = Birkhäuser | series = Modern Birkhäuser Classics | title = Plane Algebraic Curves | url = https://books.google.com/books?id=KLtvNQMVOEYC&pg=PR7 | year = 1986}}. Translated from the German original by [[John Stillwell]], 2012 reprint of the 1986 edition.</ref><ref>{{citation | last1 = Rieger | first1 = J. H. | last2 = Ruas | first2 = M. A. S. | author2-link = Maria Aparecida Soares Ruas | doi = 10.1017/S0305004105008625 | issue = 2 | journal = [[Mathematical Proceedings of the Cambridge Philosophical Society]] | mr = 2168091 | quote = For map-germs very little is known about the existence of M-deformations beyond the classical result by A’Campo and Gusein–Zade that plane curve-germs always have M-deformations. | pages = 333–349 | title = M-deformations of <math>\mathcal{A}</math>-simple <math>\Sigma^{n-p+1}</math>-germs from <math>\mathbb R^n</math> to <math>\mathbb R^p, n\ge p</math> | volume = 139 | year = 2005| s2cid = 94870364 }}</ref>

==Selected publications== *S. M. Gusein-Zade. "[https://link.springer.com/article/10.1007%2FBF01075485?LI=true Dynkin diagrams for singularities of functions of two variables]". ''Functional Analysis and Its Applications'', 1974, Volume 8, Issue 4, pp.&nbsp;295–300. *S. M. Gusein-Zade. "[https://link.springer.com/article/10.1007%2FBF02028301?LI=true Intersection matrices for certain singularities of functions of two variables]". ''Functional Analysis and Its Applications'', 1974, Volume 8, Issue 1, pp.&nbsp;10–13. *A. Campillo, F. Delgado, and S. M. Gusein-Zade. "[http://projecteuclid.org/euclid.dmj/1085598340 The Alexander polynomial of a plane curve singularity via the ring of functions on it]". ''Duke Mathematical Journal'', 2003, Volume 117, Number 1, pp.&nbsp;125–156. *S. M. Gusein-Zade. "[http://epubs.siam.org/doi/abs/10.1137/1111050?journalCode=tprbau The problem of choice and the optimal stopping rule for a sequence of independent trials]". ''Theory of Probability & Its Applications'', 1965, Volume 11, Number 3, pp.&nbsp;472–476. *S. M. Gusein-Zade. "[http://www.tandfonline.com/doi/abs/10.1559/152304093782637424#.VRY8SxrLIuk A new technique for constructing continuous cartograms]". ''Cartography and Geographic Information Systems'', 1993, Volume 20, Issue 3, pp.&nbsp;167–173.

==References== {{reflist}}

==External links== *{{IMO results|id=9995}}

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{{DEFAULTSORT:Gusein-Zade, Sabir}} [[Category:Living people]] [[Category:20th-century Russian mathematicians]] [[Category:1950 births]] [[Category:21st-century Russian mathematicians]] [[Category:Differential geometers]] [[Category:International Mathematical Olympiad participants]] [[Category:Moscow State University alumni]] [[Category:Academic staff of Moscow State University]] [[Category:Academic staff of the Independent University of Moscow]] [[Category:Mathematicians from Moscow]]