DENSITY OF THE COMMENSURABILITY GROUPS OF UNIFORM TREE LATTICES

[摘要] Let X be a universal cover of a finite connected graph, and GAMMA a group acting discretely and cocompactly on X, i.e., a uniform lattice on X. We announce a proof of the conjecture of H. Bass and R. Kulkami (J. Amer. Math. Soc. No. 4 (1990), 843-902) that the commensurability group of GAMMA is dense in the automorphism group of X. (C) 1994 Academic Press, Inc.

[发布日期] 1994-04-15