Geometrie Spring 2023

Lecturer
Tom Ilmanen
Coordinator
Raphael Appenzeller

Entry in the Vorlesungsverzeichnis VVZ.

Mobius transformations and hyperbolic geometry.

There is a forum where you can ask and answer questions.

From time to time, a script will appear here, but this will generally be a few weeks behind the lecture. Script (Version July 20, final version).

The lecture takes place Tue 11:15 - 12:00 in HG D 3.2 and Thu 14:15 - 16:00 in HG G5.

Tue, 11:15-12:00 Thu, 14:15 - 16:00, Fri
21. Feb. Introduction 23. Feb. Class cancelled Sheet 1, Solutions 1
28. Feb. Orientation and Similarities 2. Mar. Möbius transformations Sheet 2, Solutions 2
7. Mar. The Möbius transformations form a group 9. Mar. The matrix approach Sheet 3, Solutions 3
14. Mar. Generators of the Möbius transformations 16. Mar. Cayley transformation Sheet 4, Solutions 4
21. Mar. Rotation group 23. Mar. Clines Sheet 5, Solutions 5
28. Mar. Clines 30. Mar. Conformal maps Sheet 6, Solutions 6
4. Apr. Conformal maps 6. Apr. Möbius transformations preserving the disk
Easter breakSheet 7, Solutions 7

No exercise class on monday 17. Apr. (box in HG J68 for hand-ins)

18. Apr. Möb(B1) acts transitively, the Apollonian slide
20. Apr. More Möb(B1) Sheet 8 (Correction: Ex 3a, t < 1)
Solutions 8
25. Apr., Triple transitivity, a correction 27. Apr., Cross ratio Sheet 9, Solutions 9

No exercise class on monday 1. May (box in HG J68 for hand-ins)

2. May, Cross ratio is preserved under Möbius transformations.

Extra exercise class/Q&A on Wednesday May 3., 16:00 - 18:00, HG F 26.3

4. May, The hyperbolic metric.
Sheet 10, Solutions 10
9. May, the hyperbolic metric. 11. May, the acosh formula Sheet 11, Solutions 11
16. May, 18. May,

No class

Sheet 12, Solutions 12
23. May, 25. May

No exercise class on monday 29. May (box in HG J68 for hand-ins)

30. May,

Extra exercise class/Q&A on Wednesday May 31., 16:00 - 18:00, CHN G 46

1. June