#### Volume 11, issue 4 (2007)

On the virtual Betti numbers of arithmetic hyperbolic $3$–manifolds
 1 I Agol, Virtual Betti numbers of symmetric spaces, preprint 2 A Borel, Cohomologie de sous-groupes discrets et représentations de groupes semi-simples, from: "Colloque “Analyse et Topologie” en l'Honneur de Henri Cartan (Orsay, 1974)", Soc. Math. France (1976) MR0578913 3 D Cooper, D D Long, A W Reid, Essential closed surfaces in bounded $3$–manifolds, J. Amer. Math. Soc. 10 (1997) 553 MR1431827 4 P Eberlein, Geodesic flows on negatively curved manifolds I, Ann. of Math. $(2)$ 95 (1972) 492 MR0310926 5 J Hass, Surfaces minimizing area in their homology class and group actions on $3$–manifolds, Math. Z. 199 (1988) 501 MR968316 6 M Lackenby, D D Long, A W Reid, Covering spaces of arithmetic $3$–orbifolds, preprint 7 C Maclachlan, A W Reid, The arithmetic of hyperbolic 3–manifolds, Graduate Texts in Mathematics 219, Springer (2003) MR1937957 8 A W Reid, The geometry and topology of arithmetic hyperbolic $3$–manifolds 9 R Schoen, Estimates for stable minimal surfaces in three-dimensional manifolds, from: "Seminar on minimal submanifolds", Ann. of Math. Stud. 103, Princeton Univ. Press (1983) 111 MR795231 10 W P Thurston, A norm for the homology of $3$–manifolds, Mem. Amer. Math. Soc. 59 (1986) MR823443 11 T N Venkataramana, Virtual Betti numbers of compact locally symmetric spaces, preprint