Grigori Perelman
Grigori Perelman  

Born 
Leningrad, Soviet Union  13 June 1966
Nationality  Russian 
Citizenship  Russia 
Alma mater  Leningrad State University ( PhD 1990) 
Known for 

Awards 

Scientific career  
Fields  Mathematics 
Thesis  Saddle Surfaces in Euclidean Spaces (1990) 
Doctoral advisor 
Grigori Yakovlevich Perelman (Russian: Григорий Яковлевич Перельман, IPA: [ɡrʲɪˈɡorʲɪj ˈjakəvlʲɪvʲɪtɕ pʲɪrʲɪlʲˈman] ( listen); born 13 June 1966) is a Russian mathematician who is known for his contributions to the fields of geometric analysis, Riemannian geometry, and geometric topology.
In the 1990s, partly in collaboration with Yuri Burago, Mikhael Gromov, and Anton Petrunin, he made influential contributions to the study of Alexandrov spaces. In 1994, he proved the soul conjecture in Riemannian geometry, which had been an open problem for the previous 20 years. In 2002 and 2003, he developed new techniques in the analysis of Ricci flow, thereby providing a detailed sketch of a proof of the Poincaré conjecture and Thurston's geometrization conjecture, the former of which had been a famous open problem in mathematics for the past century. The full details of Perelman's work were filled in and explained by various authors over the following several years.
In August 2006, Perelman was offered the Fields Medal^{ [1]} for "his contributions to geometry and his revolutionary insights into the analytical and geometric structure of the Ricci flow", but he declined the award, stating: "I'm not interested in money or fame; I don't want to be on display like an animal in a zoo."^{ [2]} On 22 December 2006, the scientific journal Science recognized Perelman's proof of the Poincaré conjecture as the scientific " Breakthrough of the Year", the first such recognition in the area of mathematics.^{ [3]}
On 18 March 2010, it was announced that he had met the criteria to receive the first Clay Millennium Prize^{ [4]} for resolution of the Poincaré conjecture. On 1 July 2010, he rejected the prize of one million dollars, saying that he considered the decision of the board of the Clay Institute to be unfair, in that his contribution to solving the Poincaré conjecture was no greater than that of Richard S. Hamilton, the mathematician who pioneered the Ricci flow partly with the aim of attacking the conjecture.^{ [5]}^{ [6]} He had previously rejected the prestigious prize of the European Mathematical Society, in 1996.^{ [7]}
Early life and education
Grigori Yakovlevich Perelman was born in Leningrad, Soviet Union (now Saint Petersburg, Russia) on 13 June 1966, to Jewish parents^{ [8]}^{ [9]}^{ [10]} Yakov (who now lives in Israel)^{ [8]} and Lyubov (who still lives in Saint Petersburg with Grigori).^{ [8]} Grigori's mother Lyubov gave up graduate work in mathematics to raise him. Grigori's mathematical talent became apparent at the age of ten, and his mother enrolled him in Sergei Rukshin's afterschool mathematics training program.^{ [11]}
His mathematical education continued at the Leningrad Secondary School #239, a specialized school with advanced mathematics and physics programs. Grigori excelled in all subjects except physical education.^{ [12]} In 1982, as a member of the Soviet Union team competing in the International Mathematical Olympiad, an international competition for high school students, he won a gold medal, achieving a perfect score.^{ [13]} He continued as a student of The School of Mathematics and Mechanics at the Leningrad State University, without admission examinations and enrolled to the university.^{[ citation needed]}
After completing his PhD in 1990, Perelman began work at the Leningrad Department of Steklov Institute of Mathematics of the USSR Academy of Sciences, where his advisors were Aleksandr Aleksandrov and Yuri Burago. In the late 1980s and early 1990s, with a strong recommendation from the geometer Mikhail Gromov,^{ [14]} Perelman obtained research positions at several universities in the United States. In 1991 Perelman won the Young Mathematician Prize of the St. Petersburg Mathematical Society for his work on Aleksandrov's spaces of curvature bounded from below.^{ [15]} In 1992, he was invited to spend a semester each at the Courant Institute in New York University and Stony Brook University where he began work on manifolds with lower bounds on Ricci curvature. From there, he accepted a twoyear Miller Research Fellowship at the University of California, Berkeley in 1993. After having proved the soul conjecture in 1994, he was offered jobs at several top universities in the US, including Princeton and Stanford, but he rejected them all and returned to the Steklov Institute in Saint Petersburg in the summer of 1995 for a researchonly position.^{ [11]}
Research in the 1990s
Perelman's most notable work in this period was in the field of Alexandrov spaces, the concept of which dates back to the 1950s. In a wellknown 1992 paper coauthored with Yuri Burago and Mikhail Gromov, Perelman laid out the modern foundations of this field, with the notion of GromovHausdorff convergence as an organizing principle. In 1993, Perelman developed a notion of Morse theory on these nonsmooth spaces. For his work on Alexandrov spaces, Perelman was invited to lecture at the 1994 International Congress of Mathematicians.
Cheeger and Gromoll's soul conjecture, formulated in 1972, says:
 Suppose (M, g) is a complete, connected and noncompact Riemannian manifold with sectional curvature K ≥ 0, and there exists a point in M where the sectional curvature (in all sectional directions) is strictly positive. Then the soul of M is a point; equivalently M is diffeomorphic to R^{n}.
This was of interest since Cheeger and Gromoll had established the result under the stronger assumption that all sectional curvatures are positive. As the deformation from nonnegative to positive curvature is not well understood, the soul conjecture was proposed. In 1994, Perelman gave a short and elegant proof of the conjecture by establishing that in the general case K ≥ 0, Sharafutdinov's retraction P : M → S is a submersion.
Three notable papers of Perelman's from 1994 to 1997 deal with the construction of various interesting Riemannian manifolds with positive Ricci curvature.
Geometrization and Poincaré conjectures
The problem
The Poincaré conjecture, proposed by French mathematician Henri Poincaré in 1904, was one of the key problems in topology. Any loop on a 3sphere—as exemplified by the set of points at a distance of 1 from the origin in fourdimensional Euclidean space—can be contracted into a point. The Poincaré conjecture asserts that any closed threedimensional manifold, such that any loop can be contracted into a point, is topologically a 3sphere. The analogous result has been known to be true in dimensions greater than or equal to five since 1960 as in the work of Stephen Smale. The fourdimensional case resisted longer, finally being solved in 1982 by Michael Freedman. But the case of threemanifolds turned out to be the hardest of them all. Roughly speaking, this is because in topologically manipulating a threemanifold there are too few dimensions to move "problematic regions" out of the way without interfering with something else. The most fundamental contribution to the threedimensional case had been produced by Richard S. Hamilton. The role of Perelman was to complete the Hamilton program.
Perelman's proof
In November 2002, Perelman posted the first of three preprints to the arXiv, in which he claimed to have outlined a proof of the geometrization conjecture, of which the Poincaré conjecture is a particular case. This was followed by the two other preprints in 2003.^{ [16]}^{ [17]}^{ [18]}
Perelman modified Richard S. Hamilton's program for a proof of the conjecture. The central idea is the notion of the Ricci flow. Hamilton's fundamental idea is to formulate a "dynamical process" in which a given threemanifold is geometrically distorted, with the distortion process governed by a differential equation analogous to the heat equation. The heat equation (which much earlier motivated Riemann to state his Riemann hypothesis on the zeros of the zeta function) describes the behavior of scalar quantities such as temperature. It ensures that concentrations of elevated temperature will spread out until a uniform temperature is achieved throughout an object. Similarly, the Ricci flow describes the behavior of a tensorial quantity, the Ricci curvature tensor. Hamilton's hope was that under the Ricci flow concentrations of large curvature will spread out until a uniform curvature is achieved over the entire threemanifold. If so, if one starts with any threemanifold and lets the Ricci flow occur, then one should, in principle, eventually obtain a kind of "normal form". According to William Thurston this normal form must take one of a small number of possibilities, each having a different kind of geometry, called Thurston model geometries.
However, it was widely expected that the process would be impeded by developing "singularities." In the 1990s, Hamilton made progress on understanding the possible types of singularities which may occur, but was unable to provide a comprehensive description. Perelman's articles sketched a solution. According to Perelman, every singularity looks either like a cylinder collapsing to its axis, or a sphere collapsing to its center. With this understanding, he was able to construct a modification of the standard Ricci flow, called Ricci flow with surgery, which can systematically excise singular regions as they develop, in a controlled way. The idea for Ricci flow with surgery had been present since a 1993 article of Hamilton,^{ [19]} who had successfully carried it out in 1997 in the setting of higherdimensional spaces subject to certain restricted geometric conditions.^{ [20]} Perelman's surgery procedure was broadly similar to Hamilton's but was strikingly different in its technical aspects.
Perelman showed that any singularity that develops in a finite time is essentially a "pinching" along certain spheres corresponding to the prime decomposition of the 3manifold. Furthermore, any "infinite time" singularities result from certain collapsing pieces of the JSJ decomposition. Perelman's work proves this claim and thus proves the geometrization conjecture.
The contents of the three papers are summarized below:
 The first preprint, The entropy formula for the Ricci flow and its geometric applications, provides many novel techniques in the study of Ricci flow, the principal result of which is a theorem giving a quantitative characterization of highcurvature regions of the flow.
 The second preprint, Ricci flow with surgery on threemanifolds, fixed some incorrect statements of the first paper and fills in some details, and uses the main result of the first paper to prescribe the surgery procedure. The second half of the paper is devoted to an analysis of Ricci flows which exist for infinite time.
 The third preprint, Finite extinction time for the solutions to the Ricci flow on certain threemanifolds, provides a shortcut to the proof of the Poincaré conjecture which avoids the arguments in the second half of the second preprint. It shows that on any space satisfying the assumptions of the Poincaré conjecture, the Ricci flow with surgery exists only for finite time, so that the infinitetime analysis of Ricci flow is irrelevant.
Tobias Colding and William Minicozzi II have provided a completely alternative argument to Perelman's third preprint. Their argument, given the prerequisite of some sophisticated geometric measure theory arguments as developed in the 1980s, is particularly simple.
Verification
Perelman's preprints quickly gained the attention of the mathematical community, although they were widely seen as hard to understand since they had been written somewhat tersely. Against the usual style in academic mathematical publications, many technical details had been omitted. It was soon apparent that Perelman had made major contributions to the foundations of Ricci flow, although it was not immediately clear to the mathematical community that these contributions were sufficient to prove the geometrization conjecture or the Poincaré conjecture.
In April 2003, Perelman visited the Massachusetts Institute of Technology, Princeton University, Stony Brook University, Columbia University and New York University to give short series of lectures on his work, and to clarify some details for experts in the relevant fields.
In June 2003, Bruce Kleiner and John Lott, both then of the University of Michigan, posted notes on Lott's website which, section by section, filled in many of the details in Perelman's first preprint. In September 2004, their notes were updated to include Perelman's second preprint. Following further revisions and corrections, they posted a version to the arXiv on 25 May 2006, a modified version of which was published in the academic journal Geometry & Topology in 2008.^{ [21]} At the 2006 International Congress of Mathematicians, Lott said "It has taken us some time to examine Perelman's work. This is partly due to the originality of Perelman's work and partly to the technical sophistication of his arguments. All indications are that his arguments are correct." In the introduction to their article, Kleiner and Lott explained
Perelman's proofs are concise and, at times, sketchy. The purpose of these notes is to provide the details that are missing in [Perelman's first two preprints]... Regarding the proofs, [Perelman's papers] contain some incorrect statements and incomplete arguments, which we have attempted to point out to the reader. (Some of the mistakes in [Perelman's first paper] were corrected in [Perelman's second paper].) We did not find any serious problems, meaning problems that cannot be corrected using the methods introduced by Perelman.
In June 2006, the Asian Journal of Mathematics published an article by Zhu Xiping of Sun Yatsen University in China and HuaiDong Cao of Lehigh University in Pennsylvania, giving a complete description of Perelman's proof of the Poincaré and the geometrization conjectures. Unlike Kleiner and Lott's article, which was structured as a collection of annotations to Perelman's papers, Cao and Zhu's article was aimed directly towards explaining the proofs of the Poincaré conjecture and geometrization conjecture. In their introduction, they explain
In this paper, we shall present the HamiltonPerelman theory of Ricci flow. Based on it, we shall give the first written account of a complete proof of the Poincaré conjecture and the geometrization conjecture of Thurston. While the complete work is an accumulated efforts of many geometric analysts, the major contributors are unquestionably Hamilton and Perelman. [...] In this paper, we shall give complete and detailed proofs [...] especially of Perelman's work in his second paper in which many key ideas of the proofs are sketched or outlined but complete details of the proofs are often missing. As we pointed out before, we have to substitute several key arguments of Perelman by new approaches based on our study, because we were unable to comprehend these original arguments of Perelman which are essential to the completion of the geometrization program.
In July 2006, John Morgan of Columbia University and Gang Tian of the Massachusetts Institute of Technology posted a paper on the arXiv in which they provided a detailed presentation of Perelman's proof of the Poincaré conjecture.^{ [22]} Unlike KleinerLott and CaoZhu's expositions, Morgan and Tian's also deals with Perelman's third paper. On 24 August 2006, Morgan delivered a lecture at the ICM in Madrid on the Poincaré conjecture, in which he declared that Perelman's work had been "thoroughly checked."^{ [23]} In 2008, Morgan and Tian posted a paper which covered the details of the proof of the geometrization conjecture.^{ [24]} Morgan and Tian's two articles have been published in book form by the Clay Mathematics Institute.
Revisions of the verifications
All three of the expositions above have been revised after publication. KleinerLott and MorganTian's expositions were found to have errors (which didn't affect the large scope), while CaoZhu's exposition attracted criticism for their phrasing and for an attributional error.
Since publication, Kleiner and Lott's article has subsequently been revised twice for corrections, such as for an incorrect statement of Hamilton's important "compactness theorem" for Ricci flow. The latest revision to their article was in 2013. In 2015, Abbas Bahri pointed out an error in Morgan and Tian's exposition, which was later fixed by Morgan and Tian and sourced to a basic computational mistake.^{ [25]}^{ [26]}
Cao and Zhu's paper underwent criticism from some parts of the mathematical community for their word choices, which some observers interpreted as claiming too much credit for themselves. The use of the word "application" in their title "A Complete Proof of the Poincaré and Geometrization Conjectures  Application of the HamiltonPerelman Theory of Ricci Flow" and the phrase "This proof should be considered as the crowning achievement of the HamiltonPerelman theory of Ricci flow" in the abstract were particularly singled out for criticism. When asked about the issue, Perelman said that Cao and Zhu had not contributed anything original, and had simply reworked his proof because they "did not quite understand the argument".^{ [27]} Additionally, one of the pages of Cao and Zhu's article was essentially identical to one from Kleiner and Lott's 2003 posting. In a published erratum,^{ [28]} Cao and Zhu attributed this to an oversight, saying that in 2003 they had taken down notes from the initial version of Kleiner and Lott's notes, and in their 2006 writeup had not realized the proper source of the notes. They posted a revised version to the arXiv^{ [29]} with revisions in their phrasing and in the relevant page of the proof.
Current viewpoints
As of 2020, there remain some mathematicians who, although it is universally acknowledged that Perelman made tremendous strides in the theory of Ricci flow, do not accept that the Poincaré and geometrization conjectures have been proven. For these observers, the troublesome parts of the proof are in the second half of Perelman's second preprint. For instance, Fields medalist ShingTung Yau said in 2019 that^{ [30]}
Although it may be heresy for me to say this, I am not certain that the proof is totally nailed down. I am convinced, as I've said many times before, that Perelman did brilliant work regarding the formation and structure of singularities in threedimensional spaces—work that was indeed worthy of the Fields Medal he was awarded. About this I have no doubts [...] The thing is, there are very few experts in the area of Ricci flow, and I have not yet met anyone who claims to have a complete understanding of the last, most difficult part of Perelman's proof [...] As far as I'm aware, no one has taken some of the techniques Perelman introduced toward the end of his paper and successfully used them to solve any other significant problem. This suggests to me that other mathematicians don't yet have full command of this work and its methodologies either.
By contrast, when the Millennium prize was awarded to Perelman for the "resolution of the Poincaré conjecture" in 2010, Fields medalist Simon Donaldson, in one of the laudations for the prize, said^{ [31]}
From the time when [Perelman's] preprints concerning the Poincaré and Geometrisation Conjectures appeared, mathematicians around the world have been united in expressing their appreciation, awe and wonder at his extraordinary achievement, and I believe that I speak here as a representative of our whole intellectual community. [...] It solves an outstanding, centuryold, problem.
Fields Medal and Millennium Prize
In May 2006, a committee of nine mathematicians voted to award Perelman a Fields Medal for his work on the Poincaré conjecture.^{ [27]} However, Perelman declined to accept the prize. Sir John Ball, president of the International Mathematical Union, approached Perelman in Saint Petersburg in June 2006 to persuade him to accept the prize. After 10 hours of attempted persuasion over two days, Ball gave up. Two weeks later, Perelman summed up the conversation as follows: "He proposed to me three alternatives: accept and come; accept and don't come, and we will send you the medal later; third, I don't accept the prize. From the very beginning, I told him I have chosen the third one ... [the prize] was completely irrelevant for me. Everybody understood that if the proof is correct, then no other recognition is needed."^{ [27]} "I'm not interested in money or fame,' he is quoted to have said at the time. 'I don't want to be on display like an animal in a zoo. I'm not a hero of mathematics. I'm not even that successful; that is why I don't want to have everybody looking at me."^{ [32]} Nevertheless, on 22 August 2006, Perelman was publicly offered the medal at the International Congress of Mathematicians in Madrid "for his contributions to geometry and his revolutionary insights into the analytical and geometric structure of the Ricci flow".^{ [33]} He did not attend the ceremony, and declined to accept the medal, making him the only person to decline this prestigious prize.^{ [7]}^{ [34]}
He had previously rejected a prestigious prize from the European Mathematical Society.^{ [7]}
On 18 March 2010, Perelman was awarded a Millennium Prize for solving the problem.^{ [35]} On June 8, 2010, he did not attend a ceremony in his honor at the Institut Océanographique, Paris to accept his $1 million prize.^{ [36]} According to Interfax, Perelman refused to accept the Millennium prize in July 2010. He considered the decision of the Clay Institute unfair for not sharing the prize with Richard S. Hamilton,^{ [5]} and stated that "the main reason is my disagreement with the organized mathematical community. I don't like their decisions, I consider them unjust."^{ [6]}
The Clay Institute subsequently used Perelman's prize money to fund the "Poincaré Chair", a temporary position for young promising mathematicians at the Paris Institut Henri Poincaré.^{ [37]}
Possible withdrawal from mathematics
Perelman quit his job at the Steklov Institute in December 2005.^{ [38]} His friends are said to have stated that he currently finds mathematics a painful topic to discuss; by 2010, some even said that he had entirely abandoned mathematics.^{ [39]}
Perelman is quoted in a 2011 article in The New Yorker saying that he was disappointed with the ethical standards of the field of mathematics. The article implies that Perelman refers particularly to alleged efforts of Fields medalist ShingTung Yau to downplay Perelman's role in the proof and play up the work of Cao and Zhu. Perelman added, "I can't say I'm outraged. Other people do worse. Of course, there are many mathematicians who are more or less honest. But almost all of them are conformists. They are more or less honest, but they tolerate those who are not honest."^{ [27]} He has also said that "It is not people who break ethical standards who are regarded as aliens. It is people like me who are isolated."^{ [27]}
This, combined with the possibility of being awarded a Fields medal, led him to state he had quit professional mathematics by 2006. He said that "As long as I was not conspicuous, I had a choice. Either to make some ugly thing or, if I didn't do this kind of thing, to be treated as a pet. Now, when I become a very conspicuous person, I cannot stay a pet and say nothing. That is why I had to quit." (The New Yorker authors explained Perelman's reference to "some ugly thing" as "a fuss" on Perelman's part about the ethical breaches he perceived.)^{ [40]}
It is uncertain whether his resignation from Steklov and subsequent seclusion mean that he has ceased to practice mathematics. Fellow countryman and mathematician Yakov Eliashberg said that, in 2007, Perelman confided to him that he was working on other things but it was too premature to talk about it. He is said to have been interested in the past in the Navier–Stokes equations and the problem of their existence and smoothness.^{ [41]}
In 2014, Russian media reported that Perelman was working in the field of nanotechnology in Sweden.^{ [42]} However, shortly afterwards, he was spotted again in his native hometown, Saint Petersburg.^{ [42]}
Perelman and the media
Perelman has avoided journalists and other members of the media. Masha Gessen, the author of Perfect Rigour: A Genius and the Mathematical Breakthrough of the Century, a book about him, was unable to meet him.^{ [43]}
A Russian documentary about Perelman in which his work is discussed by several leading mathematicians including Mikhail Gromov was released in 2011 under the title "Иноходец. Урок Перельмана," "Maverick: Perelman's Lesson."
In April 2011, Aleksandr Zabrovsky, producer of "PresidentFilm" studio, claimed to have held an interview with Perelman and agreed to shoot a film about him, under the tentative title The Formula of the Universe.^{ [44]} Zabrovsky says that in the interview,^{ [45]} Perelman explained why he rejected the one million dollar prize.^{ [44]} A number of journalists^{ [46]}^{ [47]}^{ [48]} believe that Zabrovky's interview is most likely a fake, pointing to contradictions in statements supposedly made by Perelman.
The writer Brett Forrest briefly interacted with Perelman in 2012.^{ [49]}^{ [50]} One who managed to reach him on his mobile phone was told: "You are disturbing me. I am picking mushrooms."^{ [51]}
Complete publication list
Dissertation
 Перельман, Григорий Яковлевич (1990). Седловые поверхности в евклидовых пространствах [Saddle surfaces in Euclidean spaces] (in Russian). Ленинградский государственный университет. Автореф. дис. на соиск. учен. степ. канд. физ.мат. наук.CS1 maint: postscript ( link)
Research papers
 Perelʹman, G.Ya. Realization of abstract kskeletons as kskeletons of intersections of convex polyhedra in R^{2k − 1}. Geometric questions in the theory of functions and sets, 129–131, Kalinin. Gos. Univ., Kalinin, 1985.
 Polikanova, I.V.; Perelʹman, G.Ya. A remark on Helly's theorem. Sibirsk. Mat. Zh. 27 (1986), no. 5, 191–194, 207.
 Perelʹman, G.Ya. On the kradii of a convex body. Sibirsk. Mat. Zh. 28 (1987), no. 4, 185–186.
 Perelʹman, G.Ya. Polyhedral saddle surfaces. Ukrain. Geom. Sb. No. 31 (1988), 100–108. English translation in J. Soviet Math. 54 (1991), no. 1, 735–740.
 Perelʹman, G.Ya. An example of a complete saddle surface in R^{4} with Gaussian curvature bounded away from zero. Ukrain. Geom. Sb. No. 32 (1989), 99–102. English translation in J. Soviet Math. 59 (1992), no. 2, 760–762.
 Burago, Yu.; Gromov, M.; Perelʹman, G. A.D. Aleksandrov spaces with curvatures bounded below. Uspekhi Mat. Nauk 47 (1992), no. 2(284), 3–51, 222. English translation in Russian Math. Surveys 47 (1992), no. 2, 1–58. doi:10.1070/RM1992v047n02ABEH000877
 Perelʹman, G.Ya. Elements of Morse theory on Aleksandrov spaces. Algebra i Analiz 5 (1993), no. 1, 232–241. English translation in St. Petersburg Math. J. 5 (1994), no. 1, 205–213.
 Perelʹman, G.Ya.; Petrunin, A.M. Extremal subsets in Aleksandrov spaces and the generalized Liberman theorem. Algebra i Analiz 5 (1993), no. 1, 242–256. English translation in St. Petersburg Math. J. 5 (1994), no. 1, 215–227
 Perelman, G. Manifolds of positive Ricci curvature with almost maximal volume. J. Amer. Math. Soc. 7 (1994), no. 2, 299–305. doi:10.1090/S08940347199412316907
 Perelman, G. Proof of the soul conjecture of Cheeger and Gromoll. J. Differential Geom. 40 (1994), no. 1, 209–212. doi:10.4310/jdg/1214455292
 Perelman, G. A diameter sphere theorem for manifolds of positive Ricci curvature. Math. Z. 218 (1995), no. 4, 595–596. doi:10.1007/BF02571925
 Perelman, G. Widths of nonnegatively curved spaces. Geom. Funct. Anal. 5 (1995), no. 2, 445–463. doi:10.1007/BF01895675
 Perelman, G. Spaces with curvature bounded below. Proceedings of the International Congress of Mathematicians, Vol. 1, 2 (Zürich, 1994), 517–525, Birkhäuser, Basel, 1995. doi:10.1007/9783034890786 45
 Perelman, G. Collapsing with no proper extremal subsets. Comparison geometry (Berkeley, CA, 1993–94), 149–155, Math. Sci. Res. Inst. Publ., 30, Cambridge Univ. Press, Cambridge, 1997.
 Perelman, G. Construction of manifolds of positive Ricci curvature with big volume and large Betti numbers. Comparison geometry (Berkeley, CA, 1993–94), 157–163, Math. Sci. Res. Inst. Publ., 30, Cambridge Univ. Press, Cambridge, 1997.
 Perelman, G. A complete Riemannian manifold of positive Ricci curvature with Euclidean volume growth and nonunique asymptotic cone. Comparison geometry (Berkeley, CA, 1993–94), 165–166, Math. Sci. Res. Inst. Publ., 30, Cambridge Univ. Press, Cambridge, 1997.
Unpublished work
 Perelman, G.
Alexandrov's spaces with curvatures bounded from below II. (1991)
 See also: Kapovitch, Vitali. Perelman's stability theorem. Surveys in differential geometry. Vol. XI, 103–136, Surv. Differ. Geom., 11, Int. Press, Somerville, MA, 2007. doi:10.4310/SDG.2006.v11.n1.a5
 Perelman, G.; Petrunin, A. Quasigeodesics and gradient curves in Alexandrov spaces. (1995)
 Perelman, G. DC structure on Alexandrov space.
 Perelman, Grisha (November 11, 2002). "The entropy formula for the Ricci flow and its geometric applications". arXiv: math.DG/0211159.
 Perelman, Grisha (March 10, 2003). "Ricci flow with surgery on threemanifolds". arXiv: math.DG/0303109.
 Perelman, Grisha (July 17, 2003). "Finite extinction time for the solutions to the Ricci flow on certain threemanifolds". arXiv: math.DG/0307245.
See also
 Ancient solution
 Homology sphere
 Hyperbolic manifold
 Spherical space form conjecture
 Thurston elliptization conjecture
 Uniformization theorem
 " Manifold Destiny" (On The New Yorker article)
 Asteroid 50033 Perelman
Notes
 ^ "Fields Medals 2006". International Mathematical Union (IMU)  Prizes. Archived from the original on June 17, 2013. Retrieved April 30, 2006.
 ^ "Russian maths genius Perelman urged to take $1m prize". BBC News. March 24, 2010.
 ^ Dana Mackenzie (2006). "Breakthrough of the year. The Poincaré Conjecture—Proved". Science. 314 (5807): 1848–1849. doi: 10.1126/science.314.5807.1848. PMID 17185565.
 ^ "The Poincaré Conjecture". Archived from the original on July 5, 2014. Retrieved May 1, 2014.
 ^ ^{a} ^{b} "Последнее "нет" доктора Перельмана". Interfax. July 1, 2010. Archived from the original on July 2, 2010. Retrieved July 1, 2010.
 ^ ^{a} ^{b} Malcolm Ritter (July 1, 2010). "Russian mathematician rejects $1 million prize". AP on PhysOrg. Archived from the original on January 17, 2012. Retrieved May 15, 2011.
 ^ ^{a} ^{b} ^{c} "Maths genius declines top prize". BBC News. August 22, 2006. Archived from the original on August 15, 2010.
 ^
^{a}
^{b}
^{c} Osborn, Andrew (March 27, 2010).
"Russian maths genius may turn down $1m prize".
The Daily Telegraph.
Archived from the original on March 30, 2010. Retrieved July 2, 2010.
He has suffered antiSemitism (he is Jewish)....Grigory is pure Jewish and I never minded that but my bosses did

^ McKie, Robin (20110327).
"Perfect Rigour: A Genius and the Mathematical Breakthrough of the Century by Masha Gessen – review".
The Guardian.
Archived from the original on October 4, 2013. Retrieved 20130823.
Given that his parents were Jewish, Perelman, who was born in 1966, was fortunate in those who took up his cause.
 ^ Masha Gessen (2009, p. 48)
 ^ ^{a} ^{b} John Allen Paulos (April 29, 2010). "He Conquered the Conjecture". The New York Review of Books.
 ^ "Eccentric 'Mathsputin' Rejects Million Dollar Prize". Fox News. Archived from the original on July 15, 2014. Retrieved July 8, 2014.
 ^ "International Mathematical Olympiad". Imoofficial.org. Archived from the original on November 2, 2012. Retrieved December 25, 2012.
 ^ Masha Gessen (2009, p. 45)
 ^ "Young mathematician prize of the St. Petersburg Mathematical Society".
 ^ Perelman, Grisha (November 11, 2002). "The entropy formula for the Ricci flow and its geometric applications". arXiv: math.DG/0211159.
 ^ Perelman, Grisha (10 March 2003). "Ricci flow with surgery on threemanifolds". arXiv: math.DG/0303109.
 ^ Perelman, Grisha (July 17, 2003). "Finite extinction time for the solutions to the Ricci flow on certain threemanifolds". arXiv: math.DG/0307245.
 ^ Hamilton, Richard S. (1995). "The formation of singularities in the Ricci flow". Surveys in Differential Geometry. II: 7–136.
 ^ Hamilton, Richard S. (1997). "Fourmanifolds with positive isotropic curvature". Comm. Anal. Geom. 5 (1): 1–92. doi: 10.4310/CAG.1997.v5.n1.a1.
 ^ Kleiner, Bruce; Lott, John (2008). "Notes on Perelman's papers". Geometry & Topology. 12 (5): 2587–2855. arXiv: math/0605667. doi: 10.2140/gt.2008.12.2587. S2CID 119133773.
 ^ John W. Morgan, Gang Tian Ricci Flow and the Poincaré Conjecture ‹See Tfd› arXiv: math/0607607
 ^ "Schedule of the scientific program of the ICM 2006". Icm2006.org. Archived from the original on February 11, 2010. Retrieved March 21, 2010.
 ^ John W. Morgan, Gang Tian Completion of the Proof of the Geometrization Conjecture ‹See Tfd› arXiv: 0809.4040
 ^ Bahri, Abbas (2015). "Five gaps in mathematics". Adv. Nonlinear Stud. 15 (2): 289–319. doi: 10.1515/ans20150202. S2CID 125566270.

^ Morgan, John; Tian, Gang (2015). "Correction to Section 19.2 of Ricci Flow and the Poincare Conjecture".
arXiv:
1512.00699.
Bibcode:
2015arXiv151200699M. Cite journal requires
journal=
( help)  ^ ^{a} ^{b} ^{c} ^{d} ^{e} Nasar, Sylvia; Gruber, David (August 21, 2006). "Manifold Destiny: A legendary problem and the battle over who solved it". The New Yorker. Archived from the original on March 19, 2011. Retrieved January 21, 2011.
 ^ Cao, HuaiDong; Zhu, XiPing (2006). "Erratum to "A complete proof of the Poincaré and geometrization conjectures — application of the Hamilton–Perelman theory of the Ricci flow", Asian J. Math., Vol. 10, No. 2, 165492, 2006". Asian Journal of Mathematics. 10 (4): 663–664. doi: 10.4310/ajm.2006.v10.n2.a2. MR 2282358.
 ^ Cao, HuaiDong; Zhu, XiPing (December 3, 2006). "Hamilton–Perelman's Proof of the Poincaré Conjecture and the Geometrization Conjecture". arXiv: math.DG/0612069.
 ^ Yau, ShingTung; Nadis, Steve. The shape of a life. One mathematician's search for the universe's hidden geometry. Yale University Press, New Haven, CT, 2019. xvi+293 pp. ISBN 9780300235906
 ^ Perelman laudations. Clay Mathematical Institute (2010).
 ^ "Maths genius urged to take prize". BBC News. March 24, 2010. Archived from the original on April 19, 2010. Retrieved March 25, 2010.
 ^ "Fields Medal — Grigory Perelman" (PDF). International Congress of Mathematicians 2006. August 22, 2006.
 ^ Mullins.

^
"Prize for Resolution of the Poincaré Conjecture Awarded to Dr. Grigoriy Perelman" (PDF) (Press release).
Clay Mathematics Institute. March 18, 2010. Retrieved May 1, 2014.
The Clay Mathematics Institute (CMI) announces today that Dr. Grigoriy Perelman of St. Petersburg, Russia, is the recipient of the Millennium Prize for resolution of the Poincaré conjecture.
 ^ "Russian math genius ignores $1 million Millennium Prize". RIA Novosti. July 8, 2010. Archived from the original on June 11, 2010. Retrieved July 8, 2010.
 ^ "Poincaré Chair". Clay Institute. March 4, 2014.
 ^ Masha Gessen (2009, p. 185)
 ^ Главные новости (in Russian). RBC Information Systems. August 22, 2006. Archived from the original on July 16, 2011. Retrieved March 21, 2010.
 ^ Nasar, Sylvia; Gruber, David (August 21, 2006). "Manifold Destiny: A legendary problem and the battle over who solved it". The New Yorker. p. 11. Archived from the original on October 18, 2012. Retrieved January 21, 2011.
 ^ "Le génie qui s'est retiré du monde" [The genius who has withdrawn from the world]. Le Point (in French). September 30, 2010. pp. 74–77. Archived from the original on July 21, 2012. Retrieved October 15, 2010.
 ^ ^{a} ^{b} "Komsomolskaya Pravda" found out where Perelman disappears ANNA VELIGZHANINA
 ^ Nikolai Gerasimov (March 27, 2011). Чтобы купить русского хлеба, Перельман пешком ходил через весь НьюЙорк [To buy Russian bread, Perelman walked through the whole New York]. Komsomolskaya Pravda (in Russian). Archived from the original on September 17, 2012. Retrieved December 25, 2012.
 ^ ^{a} ^{b} Anna Veligzhanina (April 28, 2011). Интервью с математиком Григорием Перельманом: Зачем мне миллион долларов? Я могу управлять Вселенной [Interview with mathematician Grigori Perelman: Why do I need million dollars? I can control the world]. Komsomolskaya Pravda (in Russian). Archived from the original on December 27, 2012. Retrieved December 25, 2012.
 ^ "Russian math genius answers $1 million question". RIA Novosti. April 29, 2011. Retrieved December 25, 2012.
 ^ Masha Gessen (April 29, 2011). "6 странных ошибок в "интервью Перельмана"". Snob.ru. Archived from the original on October 17, 2012. Retrieved May 8, 2012.
 ^ "Интервью Перельмана  подделка?" [Interview with Perelman  fake?]. Versii. May 5, 2011. Archived from the original on December 26, 2012. Retrieved December 25, 2012.
 ^ "Grigori Perelman's interview full of mismatches". English Pravda.ru. June 5, 2011. Archived from the original on January 22, 2013. Retrieved December 25, 2012.
 ^ "Articles » Shattered Genius". Brett Forrest. Retrieved December 25, 2012.
 ^ "Seven of the week's best reads". BBC News. September 1, 2012. Archived from the original on March 8, 2013. Retrieved December 25, 2012.
 ^ Luke Harding (23 March 2010). "Grigory Perelman, the maths genius who said no to $1m". The Guardian.
References
 Gessen, Masha (2009). Perfect Rigor: A Genius and the Mathematical Breakthrough of the Century. Boston, Massachusetts: Houghton Mifflin Harcourt. ISBN 9780151014064.
 Anderson, M.T. 2005. Singularities of the Ricci flow. Encyclopedia of Mathematical Physics, Elsevier. (Comprehensive exposition of Perelman's insights that lead to complete classification of 3manifolds)
 The Associated Press, "Russian may have solved great math mystery". CNN. July 1, 2004. Archived from the original on August 13, 2006. Retrieved August 15, 2006.
 Cao, HuaiDong; Zhu, XiPing (June 2006). "A Complete Proof of the Poincaré and Geometrization Conjectures — application of the HamiltonPerelman theory of the Ricci flow" (PDF). Asian Journal of Mathematics. 10 (2). Archived from the original (PDF) on May 14, 2012. Erratum. Revised version (December 2006): HamiltonPerelman's Proof of the Poincaré Conjecture and the Geometrization Conjecture
 Collins, Graham P. (2004). "The Shapes of Space". Scientific American. 291 (July): 94–103. Bibcode: 2004SciAm.291a..94C. doi: 10.1038/scientificamerican070494. PMID 15255593.
 Jackson, Allyn (September 2006). "Conjectures No More? Consensus Forming on the Proof of the Poincaré and Geometrization Conjectures" (PDF). Notices of the AMS.
 Kleiner, Bruce; Lott, John (2008). "Notes on Perelman's papers". Geometry & Topology. 12 (5): 2587–2855. arXiv: math.DG/0605667. doi: 10.2140/gt.2008.12.2587. S2CID 119133773.
 Kusner, Rob. "Witnesses to Mathematical History Ricci Flow and Geometry" (PDF). Retrieved August 22, 2006. (an account of Perelman's talk on his proof at MIT; pdf file; also see Sugaku Seminar 200310 pp 4–7 for an extended version in Japanese)
 Lobastova, Nadejda; Hirst, Michael (August 20, 2006). "World's top maths genius jobless and living with mother". The Daily Telegraph. Archived from the original on June 8, 2014. Retrieved May 10, 2014.
 Morgan, John W.; Gang Tian (July 25, 2006). "Ricci Flow and the Poincaré Conjecture". arXiv: math.DG/0607607.
 Mullins, Justin (22 August 2006). "Prestigious Fields Medals for mathematics awarded". New Scientist.
 Overbye, Dennis (August 15, 2006). "An Elusive Proof and Its Elusive Prover". The New York Times. Retrieved August 15, 2006.
 Randerson, James (August 16, 2006). "Meet the cleverest man in the world (who's going to say no to a $1m prize)". The Guardian. London.
 Robinson, Sara (April 15, 2003). "Russian Reports He Has Solved a Celebrated Math Problem". The New York Times. Retrieved August 20, 2006.
 Schecter, Bruce (July 17, 2004). "Taming the fourth dimension". New Scientist. 183 (2456).
 Weeks, Jeffrey R. (2002). The Shape of Space. New York: Marcel Dekker. ISBN 0824707095. (The author is a former PhD student of Bill Thurston.)
 Weisstein, Eric (April 15, 2004). "Poincaré Conjecture ProvedThis Time for Real". Mathworld. Retrieved August 22, 2006.
Further reading
 Gessen, Masha (2009). Perfect Rigor: A Genius and the Mathematical Breakthrough of the Century. Houghton Mifflin Harcourt. ISBN 9780151014064. Retrieved December 12, 2012. (Story of Grigory Perelman based on information from people who interacted with him.)
External links
Media related to Grigori Perelman at Wikimedia Commons
 O'Connor, John J.; Robertson, Edmund F., "Grigori Perelman", MacTutor History of Mathematics archive, University of St Andrews.
 Grigori Perelman at the Mathematics Genealogy Project
 Grigori Perelman's results at International Mathematical Olympiad
 1966 births
 Living people
 People from Saint Petersburg
 Russian Jews
 20thcentury Russian mathematicians
 21stcentury Russian mathematicians
 Fields Medalists
 Differential geometers
 University of California, Berkeley fellows
 New York University staff
 Jewish Russian scientists
 Saint Petersburg State University alumni
 Soviet mathematicians
 Topologists
 International Mathematical Olympiad participants
 Soviet Jews