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Realization of a graph as the Reeb graph of a Morse function on a manifold

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arxiv 1805.06727 v2 pith:HXFMJTYR submitted 2018-05-17 math.GT

classification math.GT
keywords graphreebfunctiongraphsmanifoldmorsecolongamma
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abstract

We investigate the problem of the realization of a given graph as the Reeb graph $\mathcal{R}(f)$ of a smooth function $f\colon M\rightarrow \mathbb{R}$ with finitely many critical points, where $M$ is a closed manifold. We show that for any $n\geq2$ and any graph $\Gamma$ admitting the so called good orientation there exist an $n$-manifold $M$ and a Morse function $f\colon M\rightarrow \mathbb{R} $ such that its Reeb graph $\mathcal{R}(f)$ is isomorphic to $\Gamma$, extending previous results of Sharko and Masumoto-Saeki. We prove that Reeb graphs of simple Morse functions maximize the number of cycles. Furthermore, we provide a complete characterization of graphs which can arise as Reeb graphs of surfaces.

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Cited by 9 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Characterizing $3$-dimensional manifolds represented as connected sums of Lens spaces, $S^2 \times S^1$, and torus bundles over the circle by certain Morse-Bott functions

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    A closed orientable 3-manifold admits such a Morse-Bott function exactly when it is a connected sum of lens spaces, copies of S2 × S1, and torus bundles over S1.

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    For 3-manifolds made by connected sums of S^1×S^2 and lens spaces, Morse functions whose nonsingular level sets are spheres and tori are classified by their Reeb graphs with sphere or torus labels on each edge.

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