Cappell-Shaneson homotopy spheres are standard
classification
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cappell-shanesonhomotopyspheresakbulut-kirbyconstructeddiffeomorphicgeneralizesgompf
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We show that an infinite sequence of homotopy 4-spheres constructed by Cappell-Shaneson are all diffeomorphic to S^4. This generalizes previous results of Akbulut-Kirby and Gompf.
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