Math 471    Hyperbolic     Geometry

Syllabus

 

1. Euclidean, Projective and Lobachevsky Geometries: a historical summary.

    The projective plane and the Riemann sphere. The cross-ratio.

 

2. The models of a hyperbolic plane, the lines. A summary on Metrics and Riemannian metrics.

 

3. Length, angles, geodesics and isometries in Euclidean, Elliptic and Hyperbolic Geometries.

 

4. Group  PSL(2,Z)  and its action. M\"obius transformations as isometries of  H.

 

5. The fixed points and asymptotics of M\"obius transformations. Conjugacy and the trace. Elliptic and hyperbolic transformations.

 

6. Hyperbolic triangles, conformality. Gaussian curvature and the Gauss-Bonnet theorem.

 

7. Hyperbolic Trigonometry. The hyperboloid model and the Kleinian (projective) model.

 

8. The Minkovsky space and Lorentz transformations. Relation to the Special Relativity Theory.

 

9. Surfaces: polygonal models and tilings of  H.

 

10-12. Fuchsian groups and fundamental domains.