Isotoping 2-spheres in 4-manifolds
arXiv:1406.5654
Abstract
Here we discuss an example of topologically isotopic but smoothly non-isotopic pair of 2-spheres in a simply connected 4-manifold, which become smoothly isotopic after stabilizing by connected summing with S^2 x S^2.
3 pages, 2 figures. Comment on arXiv:1406.4937