-complementary generations of the Harada-Norton group
Nested symmetric representation of elements of the Suzuki chain groups.
Nicht frei äquivalente Darstellungen von Knotengruppen mit einer definierenden Relation.
Nielsen reduction in free groups with operators
Non-amenable finitely presented torsion-by-cyclic groups.
Non-amenable finitely presented torsion-by-cyclic groups
Non-free two-generator subgroups of SL2(Q).
The question of whether two parabolic elements A, B of SL2(C) are a free basis for the group they generate is considered. Some known results are generalized, using the parameter τ = tr(AB) - 2. If τ = a/b ∈ Q, |τ| < 4, and |a| ≤ 16, then the group is not free. If the subgroup generated by b in Z / aZ has a set of representatives, each of which divides one of b ± 1, then the subgroup of SL2(C) will not be free.
Nonpositive immersions, sectional curvature, and subgroup properties.
Normal-convexity and equations over groups.
Note on generalizing pregroups.
Note on the simple group of order 504
Numerical invariants of exponential groups and locally free approximation of the braid group.