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Smooth manifolds and smooth functions between them. For manifolds with additional structure, see more specific tags, such as [riemannian-geometry]. For more topological aspects, see [differential-topology].

6 votes
0 answers
191 views

Isotopy classes of $CP^1$ in 4-manifolds

Let $S_1$, $S_2$ be homologous embedded 2-spheres in a compact smooth 4-manifold. Under which additional conditions are they smoothly isotopic? I am interested in the state of the art picture when $S_ …
Misha Verbitsky's user avatar
5 votes

Smooth rank one foliations with closed leaves

The question was already answered by Jorge Vitório Pereira, but let me add here what I have already found. Recall that a foliation on a Riemannian manifold is called "Riemannian foliation" if the rest …
Misha Verbitsky's user avatar
9 votes
2 answers
361 views

Smooth rank one foliations with closed leaves

Let $F$ be a smooth rank one foliation on a manifold $M$. Suppose that all leaves of $F$ are compact (that is, circles). Then its leaf space (edit: when additional assumptions are taken) is an orbifol …
Misha Verbitsky's user avatar
2 votes

Holonomy group of a non-compact Kaehler manifold

Yes, the holonomy of this manifold is in $SU(n)$. Indeed, the Chern connection on the canonical bundle is flat and its holonomy preserves $\Omega$, because its curvature is $\partial\bar\partial |\Ome …
Misha Verbitsky's user avatar