When a subset of locally lies on a sphere
When ε-boundaries are manifolds
Which 3-manifold groups are Kähler groups?
The question in the title, first raised by Goldman and Donaldson, was partially answered by Reznikov. We give a complete answer, as follows: if can be realized as both the fundamental group of a closed 3-manifold and of a compact Kähler manifold, then must be finite—and thus belongs to the well-known list of finite subgroups of , acting freely on .
Which 4-manifolds are toric varieties?
Whitehead 3 is a "Slice" Link.
Whitehead doubling persists.
Whitney regularity and generic wings
Given adjacent subanalytic strata in verifying Kuo’s ratio test (resp. Verdier’s -regularity) we find an open dense subset of the codimension submanifolds (wings) containing such that is generically Whitney -regular is exactly one more than the dimension...
Winding Numbers on Surfaces II. Applications.