Abstract
In 1987 Paul Erdös asked me if the Cayley graph defined on ℤ by a lacunary sequence has necessarily a finite chromatic number. Below is my answer, delivered to him on the spot but never 1 published, and some additional remarks. The key is the interpretation of the question in terms of return times of dynamical systems.
| Original language | English |
|---|---|
| Pages (from-to) | 211-219 |
| Number of pages | 9 |
| Journal | Combinatorica |
| Volume | 21 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2001 |
| Externally published | Yes |