Preprints and unpublished manuscripts

  Roots of Dehn twists (with Kashyap Rajeevsarathy), preprint, download from Mathematics
ArXiv,  and software.

  Tunnel leveling, depth, and bridge numbers (with Sangbum Cho), preprint, download from Mathematics
ArXiv,  and software.

  Constructing knot tunnels using giant steps (with Sangbum Cho), to appear in Proc. Amer. Math. Soc., download from Mathematics
ArXiv,  and software.

  Diffeomorphisms of elliptic 3-manifolds (with Sungbok Hong, John Kalliongis, and J. H. Rubinstein), preliminary version,  pdf.

  Writing elements of PSL(2,q) as commutators (with Marcus Wanderley), preprint,  dvi,  pdf,  ps.

  The action of the modular group on characters of SL(2,q)-representations of F2 (with Marcus Wanderley), unpublished manuscript,  dvi,  pdf,  ps,  and software.

  Exceptional subgroups of SL(2,F), unpublished manuscript  dvi,  pdf,  ps.

  The refined relative compression body neighborhood (with Richard D. Canary), unpublished manuscript,  dvi,  pdf,  ps.