| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5777785 | Topology and its Applications | 2017 | 30 Pages |
Abstract
The article contains well-known old results, recent results dispersed in many sources, and several new facts obtained by the authors of this contribution. Selected open problems are included here to indicate that this area of research is far from complete.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Geometry and Topology
Authors
Aleksander BÅaszczyk, Mikhail Tkachenko,