The paper asserts width and S1-stability PSC results for simply connected 4-manifolds up to homeomorphism, but the proof rests on a false disk-filling lemma.
The disc embedding theorem
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Positive scalar curvature and exotic structures on simply connected four manifolds
The paper asserts width and S1-stability PSC results for simply connected 4-manifolds up to homeomorphism, but the proof rests on a false disk-filling lemma.