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Professor of Mathematics and Director of the Algebraic Cryptology Center Stevens Institute of Technology Hoboken, NJ 07030 Phone (201) 216-5440, Fax (201) 216-8321 ![]() |
| Word hyperbolic semigroups, Math. Proc. Camb. Phil. Soc., 136 (2004) 513-524 (with Andrew Duncan). Introduction, postscript , pdf. |
| On the definition of word hyperbolic groups, Math. Zeitschr. 242 (2002) 529-541. Abstract, dvi (55K, no pictures), pdf. |
| Context-free languages of sub-exponential growth, J. Computer and System Sci., J. Comput. System Sci. 64 (2002) 308-310. (with Martin Bridson). dvi, pdf. |
| Web version of three talks on groups and formal languages. |
| On groups whose word problem is solved by a nested stack automaton, (with Michael Shapiro). Abstract, dvi (67K), dvi.gz (28K), pdf (184K). |
| Combing nilpotent and polycyclic groups, Int. J. of Algebra and Computation 9 (1999) 135-155 (with Derek Holt and Sarah Rees). Abstract, dvi (95K), dvi.gz (40K), pdf (246K). |
| A shrinking lemma for indexed languages, Theoretical Computer Sci. 163 (1996) 277-281. Abstract, dvi (20K), dvi.gz (10K), pdf (115K). |
| Formal languages and infinite groups, in Geometric and Computational Perspectives on Infinite Groups (Minneapolis, MN and New Brunswick, NJ, 1994),, DIMACS Ser. Discrete Math. Theoret. Comput. Sci. 25 (1996) 27-51, Amer. Math. Soc. Abstract, dvi (109K), dvi.gz (44K), pdf (275K). |
| Formal language theory and the geometry of 3-manifolds, Commentarii Math. Helv. 71 (1996) 525-555, (with Martin Bridson). Abstract, dvi (136K), dvi.gz (58K), pdf (339K). |
| On bounded languages and the geometry of nilpotent groups, in Combinatorial and Geometric Group Theory, Edinburgh 1993, London Math. Soc. Lecture Notes 204 (1995) 1-15, Cambr. U. P., (with Martin Bridson). Abstract, dvi (67K), dvi.gz (28K), pdf (206K). |
| Automatic Groups and String Rewriting, in Proc. of the Ecole de Printemps d'Informatique Théorique, Font Romeu, May 17-21, 1993, Springer Lecture Notes in Comp. Sci. 909 (1995) 17-21. Abstract, dvi (37K), dvi.gz (16K), pdf (121K). |
| The geometry of cycles in the Cayley diagram of a group, in The Mathematical Legacy of Wilhelm Magnus, Contemporary Mathematics 169 (1994) 331-340, Amer. Math. Soc. Abstract, dvi (42K), dvi.gz (19K), pdf (166K). |
| A remark about combings of groups, Int. J. of Algebra and Computation 3 (1993) 575-581 (with Martin Bridson). Abstract, dvi (27K), dvi.gz (13K), pdf (124K). |