arXiv
Open Access
2021
Round fold maps on $3$--manifolds
Naoki Kitazawa
Osamu Saeki
Abstrak
We show that a closed orientable 3--dimensional manifold admits a round fold map into the plane, i.e. a fold map whose critical value set consists of disjoint simple closed curves isotopic to concentric circles, if and only if it is a graph manifold, generalizing the characterization for simple stable maps into the plane. Furthermore, we also give a characterization of closed orientable graph manifolds that admit directed round fold maps into the plane, i.e.\ round fold maps such that the number of regular fiber components of a regular value increases toward the central region in the plane.
Topik & Kata Kunci
Penulis (2)
N
Naoki Kitazawa
O
Osamu Saeki
Akses Cepat
Informasi Jurnal
- Tahun Terbit
- 2021
- Bahasa
- en
- Sumber Database
- arXiv
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- Open Access ✓