Topologi på roterommet

BID, February 2013 (At h-bar)

1. Is size always important?
2. To comb the hair of a sphere
3. The Euler charcteristic
4. Fusion reactors
5. A flat world?
6. Pacman's universe
7. What is the shape of space?
8. A flat but finite universe
A. State spaces
B. The study of spaces
C. What is a deformation?
D. How to calculate with spaces

A flat but finite universe

Vrenger skjermenVi identifiserer kantene A og vi identifiserer kantene B

Vrenger skjermen Travel into space, letting out string as you go.
If you come home, grab both ends of the string: Pacman har fanget et hull

try pulling in your lasso.

If you can't: you may have caught a "hole" in the universe!

Other 2D universes

Bjørn Ian Dundas