## The homotopy class of non-singular Morse-Smale vector fields on 3- manifolds.(English)Zbl 0622.58018

Let M be a 3-manifold with Euler characteristic zero. Denote by F(M) the set of homotopy classes of nonsingular vector fields on M. The author studies the problem of the existence of non-singular Morse Smale (NMS) flows in a given homotopy class. For M being a graph manifold prime to $$S^ 1\times S^ 2$$ necessary and sufficient conditions are given under which a class $$\Phi\in F(M)$$ contains an NMS flow (theorem 1). An analogous result is obtained for a non-graph manifold M supposing M admits an NMS flow (theorem 2).

### MSC:

 37D15 Morse-Smale systems

### Keywords:

Morse-Smale flows; Euler characteristic zero
Full Text:

### References:

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