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JOURNALS // Matematicheskii Sbornik // Archive

Mat. Sb., 2010 Volume 201, Number 4, Pages 33–98 (Mi sm7557)

This article is cited in 9 papers

Framed Morse functions on surfaces

E. A. Kudryavtseva, D. A. Permyakov

M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics

Abstract: Let $M$ be a smooth, compact, not necessarily orientable surface with (maybe empty) boundary, and let $F$ be the space of Morse functions on $M$ that are constant on each component of the boundary and have no critical points at the boundary. The notion of framing is defined for a Morse function $f\in F$. In the case of an orientable surface $M$ this is a closed 1-form $\alpha$ on $M$ with punctures at the critical points of local minimum and maximum of $f$ such that in a neighbourhood of each critical point the pair $(f,\alpha)$ has a canonical form in a suitable local coordinate chart and the 2-form $df\wedge\alpha$ does not vanish on $M$ punctured at the critical points and defines there a positive orientation. Each Morse function on $M$ is shown to have a framing, and the space $F$ endowed with the $C^\infty$-topology is homotopy equivalent to the space $\mathbb F$ of framed Morse functions. The results obtained make it possible to reduce the problem of describing the homotopy type of $F$ to the simpler problem of finding the homotopy type of $\mathbb F$. As a solution of the latter, an analogue of the parametric $h$-principle is stated for the space $\mathbb F$.
Bibliography: 41 titles.

Keywords: Morse functions, framed Morse functions, equivalence of functions, compact surface, $C^\infty$-topology.

UDC: 515.164.174+515.164.22+515.122.55

MSC: 57R45, 58D15

Received: 18.03.2009 and 02.07.2009

DOI: 10.4213/sm7557


 English version:
Sbornik: Mathematics, 2010, 201:4, 501–567

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