Akbulut's corks and h-cobordisms of smooth simply connected 4-manifolds
arXiv:math/9712231
Abstract
This is primarily an exposition, combining work of several authors (Curtis, Hsiang, Freedman, Stong, Matveyev, and Bizaca), of the proof that a smooth 5-dimensional h-cobordism between simply connected 4-manifolds is a product off of a contractible piece which itself is diffeomorphic to the 5-ball.
arXiv comment11 pages
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