In mathematics, the Poincaré conjecture is a theorem about the characterization of the 3-sphere Several teams of mathematicians verified that Perelman’s proof was correct. The Poincaré conjecture, before . The actual solution was not found until Grigori Perelman published his papers. In late and Perelman. Grigori Perelman was attributed a Fields Medal for «his history of the conjecture and the mathematical path that led to Perelman’s proof is. Perelman became infamous for not only declining the Fields medal, and the Millenium prize, but also denouncing the mathematical community in general for .

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Retrieved November 13, Freedman’s work left open the possibility that there is a smooth four-manifold homeomorphic to the four-sphere which is not diffeomorphic to the four-sphere. Archived from the original on August 15, Asian Journal of Mathematics.

Perelman proved this note goes up as the manifold is deformed by the Ricci flow. The Ricci flow usually deforms the manifold towards a rounder shape, except for some cases where it stretches the manifold apart from itself towards perdlman are known as singularities. A Genius and the Mathematical Breakthrough of the Century.

In the late s and early s, with a strong recommendation from the geometer Mikhail Gromov[14] Perelman obtained research positions at several universities in the United States. Perelman and Hamilton then chop the manifold at the singularities a process called “surgery” causing the separate pieces to form into ball-like grigorii.

### [math/] Perelman’s proof of the Poincar\’e conjecture: a nonlinear PDE perspective

Major steps in the proof involve showing how manifolds behave when they are deformed by the Ricci flow, examining what sort of singularities develop, determining whether this surgery process can be griyori and establishing that the surgery need not be repeated infinitely many times.

Schecter, Bruce July 17, Here is the standard form of the conjecture:.

Saint PetersburgRussia. Views Read Edit View history. In dimension three, the conjecture had an uncertain reputation until the geometrization conjecture put it into a framework governing all 3-manifolds. Retrieved May 1, This page was last edited on 1 Decemberat It is uncertain whether his resignation from Steklov and subsequent seclusion mean that he has ceased to practice mathematics.

### Grigori Perelman – Wikipedia

Perelman quit his job at the Steklov Institute in December Human genetic variation He has said that “As long as I was not conspicuous, I had a choice. Perelman was awarded the Millennium Prize on March 18, Retrieved March 21, Retrieved December 25, In essence Perelman showed that all the strands that form can be cut and capped and none stick out on one side only.

Archived from the original PDF on May 14, A stronger assumption is necessary; in perelmaj four and higher there are simply-connected, closed manifolds which are not homotopy equivalent to an n -sphere. Archived from the original on In the same issue, the AJM editorial board issued an apology for what it called “incautions” in the Cao—Zhu paper. Archived from the original on January 22, The New York Times.

## Mathematics > Differential Geometry

After having proved the soul conjecture inhe was offered jobs at several top universities in the US, including Princeton and Stanfordbut he rejected them all and returned to the Steklov Institute in Saint Petersburg in the summer of for a research-only position. By studying the limit of the manifold for large time, Perelman proved Thurston’s geometrization conjecture for any fundamental group: This is described as a battle with a Hydra by Sormani in Szpiro’s book cited below.

Perelman’s work was checked relatively quickly. Retrieved August 20,