Thursday, March 28, 2019 1:30 pm
-
1:30 pm
EDT (GMT -04:00)
Title: Not colouring the 3-sphere
| Speaker: | Chris Godsil |
| Affiliation: | Unioversity of Waterloo |
| Room: | MC 6486 |
Abstract:
Let S(3) be the graph formed by the unit vectors in R3, two vectors adjacent if they are orthogonal. I will prove that S(3) has no 3-colouring. The surprise is that the proof involves a detour through the theory of valuations of fields.