əpɐɯ ı ɟɟnʇs əɯos
Figure 1. A typical simple closed curve on a surface is complicated, from the point of view of someone tracing out the curve.
William P. Thurston. On the geometry and dynamics of diffeomorphisms of surfaces. Bulletin of the AMS 19(2):417–431, 1988.
The First Seven Orders of Knottiness by P.G. Tait
Yes, it’s math. I’m sorry, is this a joke?
Solve the Riemann hypothesis & get a free burrito!
A path in a triangulated disk. Some junctions are colored red; some streets are colored blue.
I am serious. And don’t call me Shirley.
I shall become an algebrist!
Right, left, right, left, right, right, right, right.