Global topologies of Reeb spaces of stable fold maps with non-trivial top homology groups

Abstract

The Reeb space of a continuous map is the space of all (elements representing) connected components of preimages endowed with the quotient topology induced from the natural equivalence relation on the domain. These objects are strong tools in (differential) topological theory of Morse functions, fold maps, which are their higher dimensional variants, and so on: they are in general polyhedra whose dimensions are same as those of the targets. In suitable cases Reeb spaces inherit topological information such as homology groups, cohomology rings, and so on, of the manifolds. This presents the following problem: what are global topologies of Reeb spaces of these smooth maps of suitable classes like? The present paper presents families of stable fold maps having Reeb spaces with non-trivial top homology groups with their (co)homology groups (and rings). Related studies on the global topologies from the viewpoints of the singularity theory of differentiable maps and differential topology have been presented by various researchers including the author. The author previously constructed families of fold maps with Reeb spaces with non-trivial top homology groups and with good topological properties. This paper presents new families, especially, generalized situations of some known situations.

18 pages, several phrases corrected,

References in corpus (6)

• Reeb spaces of smooth functions on manifolds
• Surgery operations to fold maps to construct fold maps whose restrictions to the singular sets may not be embeddings
• Surgery operations to fold maps to increase connected components of singular sets by two
• Special generic maps and fold maps and information on triple Massey products of higher dimensional differentiable manifolds
• Closed manifolds admitting no special generic maps whose codimensions are negative and their cohomology rings
• Explicit remarks on the torsion subgroups of homology groups of Reeb spaces of explicit fold maps

Cited by in corpus (1)

• Branched surfaces homeomorphic to Reeb spaces of simple fold maps