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

The projective plane RP2

mobius mobius

Build RP2 at home:
  1. take a Möbius band, (whose boundary is a circle) and
  2. attach a disc.

to elektroner to elektroner to elektroner to elektronerThis hole "disappears" if you go around it twice,

Bjørn Ian Dundas