🔬 Discovery

Proof of the Poincaré and geometrization conjectures

Prueba de la conjetura de Poincaré y de la geometrización

Date
2002-2003 · confidence high
Place
St Petersburg (Steklov Institute), Russia
Credited to
Grigori Perelman; Richard Hamilton's Ricci flow (1982); Thurston's geometrisation conjecture (1982)
People
👤 Grigori Perelmán1966–
Field
Knowledge & symbols

What was discovered

Using Ricci flow with surgery, Perelman proved that every 3-manifold decomposes into pieces with one of eight geometries, which implies the Poincaré conjecture. The only Millennium Problem solved.

Published only on arXiv; Perelman turned down the Fields Medal (2006) and the Millennium Prize (2010).

What it led to

  • geometric analysis
  • the complete classification of 3-manifolds
  • geometric flow techniques
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