Pappus's theorem and the modular group
Positively curved combinatorial 3-manifolds.
Presentation of hyperelliptic periodic monodromies and splitting families.
Presentations for the punctured mapping class groups in terms of Artin groups.
Properly homotopic nontrivial planes are isotopic
It is proved that two planes that are properly homotopic in a noncompact, orientable, irreducible 3-manifold that is not homeomorphic to are isotopic. The end-reduction techniques of E. M. Brown and C. D. Feustal and M. G. Brin and T. L. Thickstun are used.