Timeline for Your favorite surprising connections in mathematics
Current License: CC BY-SA 2.5
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 5, 2017 at 13:09 | comment | added | Takahiro Waki | >>3) Because dimension 4 has infinite differential structure? | |
| Sep 1, 2011 at 6:40 | comment | added | Ryan Budney | @Jim: From Hillman's "Four-manifolds, Geometries and Knots", up to homeomorphism there are only 11 geometric 4-dimensional manifolds with finite fundamental group. In dimension 4 a finite-volume hyperbolic manifold's volume is a function of its Euler characteristic. I see those as having a fair bit of content. Sorry for being slow to reply. | |
| Mar 13, 2011 at 17:44 | comment | added | Jim Conant | @Ryan: is the fact that geometry is less useful in high dimensions an empirical observation, or is there more mathematical content to this? | |
| Feb 8, 2010 at 5:50 | history | answered | Ryan Budney | CC BY-SA 2.5 |