The associahedron or Stasheff polytope.
(source: wikimedia.org)
4 of 4
broken image fixed (click 'rendered output' to see the difference; image retrieved via Wayback Machine); for more info, see https://meta.mathoverflow.net/a/4058/70594
Glorfindel
- 2.8k
- 6
- 28
- 38
Gil Kalai
- 24.7k
- 38
- 235
- 327