The smooth four-dimensional Poincaré conjecture

Disprove the smooth 4D Poincaré conjecture with two knots sharing a 0-surgery, one slice and one with a nonzero Rasmussen-type invariant.

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	1	+{
	2	+ "domain": "mathematics",
	3	+ "topics": [
	4	+ "geometry-topology"
	5	+ ],
	6	+ "type": "construction",
	7	+ "also": [
	8	+ "proof"
	9	+ ],
	10	+ "source": {
	11	+ "key": "frontiermath-open",
	12	+ "name": "FrontierMath: Open Problems",
	13	+ "url": "https://epoch.ai/frontiermath/open-problems/smooth-poincare-4d",
	14	+ "id": "smooth-poincare-4d",
	15	+ "curator": "Epoch AI",
	16	+ "status": "unsolved",
	17	+ "as_of": "2026-10-20",
	18	+ "catalog": "0521c19bbd38"
	19	+ }
	20	+}