sigcensus - Form a census of splitting surface signatures
Contents
Description
Forms a census of all splitting surface signatures of the given order. The order is the number of
quadrilaterals in the resulting splitting surface.
The signatures will be written to standard output, one per line, followed by a count of the total number
of signatures found.
Each signature will be output precisely once up to equivalence. Signatures are considered equivalent if
they are related by some combination of:
• relabelling symbols;
• rotating an individual cycle;
• inverting an individual cycle (i.e., reversing the cycle and changing the case of each symbol in the
cycle);
• reversing all cycles without changing the case of any symbols.
Upper-case symbols in signatures are not yet supported; this program will only output signatures whose
symbols are all lower-case.
For more information on splitting surface signatures, see Burton's PhD thesis at
http://www.maths.uq.edu.au/~bab/papers/.
Macos Users
If you downloaded a drag-and-drop app bundle, this utility is shipped inside it. If you dragged Regina
to the main Applications folder, you can run it as /Applications/Regina.app/Contents/MacOS/sigcensus.
Name
sigcensus - Form a census of splitting surface signatures
See Also
censuslookup, tricensus, regina-gui.
Synopsis
sigcensusorder
Windows Users
The command-line utilities are installed beneath the ProgramFiles directory; on some machines this
directory is called ProgramFiles(x86). You can start this utility by running
c:\Program Files\Regina\Regina 7.0\bin\sigcensus.exe.
