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The diameter sphere theorem up to diffeomorphism
Decide whether a manifold with sectional curvature at least 1 and diameter above π/2 must be diffeomorphic to the standard sphere.
| 1 | { |
| 2 | "domain": "mathematics", |
| 3 | "topics": [ |
| 4 | "geometry-topology" |
| 5 | ], |
| 6 | "type": "proof", |
| 7 | "source": { |
| 8 | "key": "aimpl", |
| 9 | "name": "AIM Problem Lists", |
| 10 | "url": "http://aimpl.org/nnsectcurvature/1/", |
| 11 | "id": "nnsectcurvature 1.2", |
| 12 | "curator": "American Institute of Mathematics", |
| 13 | "status": "open", |
| 14 | "as_of": "2026-10-20", |
| 15 | "catalog": "0521c19bbd38" |
| 16 | }, |
| 17 | "review": true, |
| 18 | "approval": "first-time" |
| 19 | } |