Algebraic Characterization of Isometries of the Complex and Quaternionic Hyperbolic Planes

Details Algebraic Characterization of Isometries of the Complex and Quaternionic Hyperbolic Planes Algebraic Characterization of Isometries of the Complex and Quaternionic Hyperbolic Planes

2009-09-05

arxiv.org/abs/0909.1005v7

Mathematics

Geometric Topology

to appear in Geom. Dedicata

Scientific paper

It is of interest to characterize algebraically the dynamical types of isometries of the complex and quaternionic hyperbolic planes. In the complex case, such a characterization is known from the work of Giraud-Goldman. In this paper, we offer an algebraic characterization of the isometries of the two-dimensional quaternionic hyperbolic space. Our result restricts to the complex case and provides another characterization of the isometries of the complex hyperbolic plane which is different from the characterization due to Giraud-Goldman. Two elements in a group G are said to be in the same z-class if their centralizers are conjugate in G. The $z$-classes provide a finite partition of the isometry group. In this paper we describe the centralizers of the isometries, and determine the z-classes.

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