Office: 353 Altgeld Hall
Phone: (217) 333-1610
Fax: (217) 333-9576
Area of interest and specialization:
(with R.C. Lyndon), Combinatorial group theory (Reprint of the 1977 edition). In Classics in Mathematics, Springer-Verlag, Berlin (2001).
(with S. Ivanov), A remark on finitely generated subgroups of free groups. In Algorithmic Problems in Groups and Semigroups (J.-C. Birget, S. Margolis, J. Meakin, M. Sapir, Eds.), Birhäuser, Boston (2000) 139-142.
(with D. Beauquier and D. Muller), The bar problem -- a simple tiling problem which is NP-complete on the Euclidean tessellation by squares but which is polynomial time on hyperbolic tesselations by 4g-gons. In Groups, Languages and Geometry (R. Gilman, Ed.), Comtemporary Mathematics, Vol. 250, American Mathematical Society (1999) 29--36.
(with C.F. Miller, III), Some presentations of the trivial group. In Groups, Languages and Automata (R. Gilman, Ed.), Contemporary Mathematics, Vol. 250, American Mathematical Society (1999) 113--115.
(with S. Ivanov), On the hyperbolicity of small cancellation groups and one-relator groups, Trans. Amer. Math. Soc. 350 (1998) 1851--1894.
On the structure of Hamiltonian cycles in the Cayley graphs of finite quotients of the modular group, Theoretical Comput. Sci. 204 (1998) 233--248.
Last modified May 22, 2001