Journal of Lie Theory, Vol. 10, No. 1, pp. 171-180 (2000)

Some linear groups virtually having a free quotient

G. A. Margulis and E. B. Vinberg

G. A. Margulis
Yale University
10 Hill House Avenue
P.O.Box 208283
New Haven CT 06520
USA
margulis@lom1.math.yale.edu
and
E. B. Vinberg
Moscow University
119899 Moscow
Russia
vinberg@ebv.pvt.msu.su

Abstract: It is proved that some discrete automorphism groups of convex cones have a finite index subgroup that maps onto a free group of rank 2. This generalizes recent results of A. Lubotzky.

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