Abstract
Contents
A. Motivation
B. Evident restrictions
C. Isotropic semi-simple groups over fields
D. Short remarks on O'Meara's method
E. Tits' results on homomorphisms of Lie groups
F. Rigidity, strong rigidity, and superrigidity of lattices
G. Quotient groups of lattices
H. Lattices in PSO(n,1) and PSU(n,1)
I. Concluding remarks
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