Topology and Combinatorial Group Theory

On two relator groups.- When is the homotopy set [X, Y] infinite?.- Local collapses for diagrammatic reducibility.- Periodic knots and desuspensions of free involutions on spheres.- The Tits conjecture and the five string braid group.- The finite basis extension property and graph groups.- Subgroup presentations without coset representatives.- Fractal dimensions of limit sets of some Kleinian groups.- Bounded cancellation of automorphisms of free products.- A short topological proof of Cohn's theorem.- On the homotopy type of 2-complexes with a free product of cyclic groups as fundamental group.- Bias ideals and obstructions to simple-homotopy equivalence.- Embeddings of acyclic 2-complexes in S 4 with contractible complement.- Fixed subsets of homomorphisms of free groups.- Note on a conjecture of Stephen Halperin's.- On the rank, the deficiency and the homological dimension of groups: The computation of a lower bound via fox ideals.- A reduced spherical diagram into a ribbon-disk complement and related examples.- * - Groups, graphs, and bases.- Some topological graph theory for topologists: A sampler of covering space constructions.