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.

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	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	+}