Toby Hall: Software for download


Trains: a program for computing train tracks of surface homeomorphisms

This program is an implementation of Bestvina and Handel's algorithm for determining train tracks of surface homeomorphisms (Topology 34 (1995), 109-140). The current version of the program is for Windows only.

You can download the executable and a help file containing detailed instructions (which should be placed in the same directory as the executable). There is also a pdf version of the documentation, which is not so conveniently indexed as the windows help file, but may be better for some purposes.


Dynn: a program for working with Dynnikov coordinates

This program is designed for calculations involving the action of braids on integral laminations and measured foliations on punctured disks, using Dynnikov's coordinate system. It is available as a Windows executable (to be run on the command line) only.

You can download the executable, and a PDF file which contains a very brief summary of Dynnikov's coordinates together with instructions for running the program.


If you have any problems with or questions about these programs, please contact Toby Hall.