HOMOLOGY SPHERES AND CONTRACTIBLE COMPACT MANIFOLDS
A Z Dymov · Mathematics of the USSR-Izvestiya · 1971
Conditions are found for which PL-homeomorphic homology spheres are diffeomorphic. It is shown that compact contractible manifolds with diffeomorphic boundaries are diffeomorphic. An analog of the group Γn of pseudoisotopies is investigated for compact contractible manifolds.