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- Q4634017 subject Q7139601.
- Q4634017 subject Q8981903.
- Q4634017 abstract "In mathematics, the 2π theorem of Gromov and Thurston states a sufficient condition for Dehn filling on a cusped hyperbolic 3-manifold to result in a negatively curved 3-manifold. Let M be a cusped hyperbolic 3-manifold. Disjoint horoball neighborhoods of each cusp can be selected. The boundaries of these neighborhoods are quotients of horospheres and thus have Euclidean metrics. A slope, i.e. unoriented isotopy class of simple closed curves on these boundaries, thus has a well-defined length by taking the minimal Euclidean length over all curves in the isotopy class. The 2π theorem states: a Dehn filling of M with each filling slope greater than 2π results in a 3-manifold with a complete metric of negative sectional curvature. In fact, this metric can be selected to be identical to the original hyperbolic metric outside the horoball neighborhoods. The basic idea of the proof is to explicitly construct a negatively curved metric inside each horoball neighborhood that matches the metric near the horospherical boundary. This construction, using cylindrical coordinates, works when the filling slope is greater than 2π. See Bleiler & Hodgson (1996) for complete details.According to the geometrization conjecture, these negatively curved 3-manifolds must actually admit a complete hyperbolic metric. A horoball packing argument due to Thurston shows that there are at most 48 slopes to avoid on each cusp to get a nonhyperbolic 3-manifold. For one-cusped hyperbolic 3-manifolds, an improvement due to Colin Adams gives 24 exceptional slopes. This result was later improved independently by Ian Agol (2000) and Marc Lackenby (2000) with the 6 theorem. The "6 theorem" states that Dehn filling along slopes of length greater than 6 results in a hyperbolike 3-manifold, i.e. an irreducible, atoroidal, non-Seifert-fibered 3-manifold with infinite word hyperbolic fundamental group. Yet again assuming the geometrization conjecture, these manifolds have a complete hyperbolic metric. An argument of Agol's shows that there are at most 12 exceptional slopes.".
- Q4634017 wikiPageWikiLink Q1053743.
- Q4634017 wikiPageWikiLink Q1503309.
- Q4634017 wikiPageWikiLink Q1935541.
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- Q4634017 wikiPageWikiLink Q3527192.
- Q4634017 wikiPageWikiLink Q3532121.
- Q4634017 wikiPageWikiLink Q353451.
- Q4634017 wikiPageWikiLink Q395.
- Q4634017 wikiPageWikiLink Q5144840.
- Q4634017 wikiPageWikiLink Q5535513.
- Q4634017 wikiPageWikiLink Q5957770.
- Q4634017 wikiPageWikiLink Q5957776.
- Q4634017 wikiPageWikiLink Q662830.
- Q4634017 wikiPageWikiLink Q7139601.
- Q4634017 wikiPageWikiLink Q757686.
- Q4634017 wikiPageWikiLink Q81194.
- Q4634017 wikiPageWikiLink Q8981903.
- Q4634017 comment "In mathematics, the 2π theorem of Gromov and Thurston states a sufficient condition for Dehn filling on a cusped hyperbolic 3-manifold to result in a negatively curved 3-manifold. Let M be a cusped hyperbolic 3-manifold. Disjoint horoball neighborhoods of each cusp can be selected. The boundaries of these neighborhoods are quotients of horospheres and thus have Euclidean metrics. A slope, i.e.".
- Q4634017 label "2π theorem".