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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Pure Maths Colloquium: Geometric and algebraic invariants in the complex hyperbolic plane.

Presented by Pierre Will, Institut Fourier, Universit ́e Grenoble I

2 March 2015 16:00 in CM221

In this talk, we will study different kinds of invariants for representations of F2, the free group of rank 2, in SU(2,1). In particular, we will focus on the corresponding character variety of F2, and understand geometrically special subvarieties obtained as fixed points of natural involutions. This involves relating algebraic invariants such as traces or eigenvalues, with geometric invariants, such as triple ratios or cross-ratios.

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