Smoothability of Z\times Z-actions on 4-manifolds
arXiv:0902.3172
Abstract
We construct a nonsmoothable Z\times Z-action on the connected sum of an Enriques surface and S^2\times S^2, such that each of generators is smoothable. We also construct a nonsmoothable self-homeomorphism on an Enriques surface.
arXiv comment6 pages