> Much more complicated would it be to construct a Seifert surface of > *minimal* genus. It is possible, though, based on the theory of normal > surfaces that goes back to Wolfgang Haken. In a nutshell (hope I > remember things correctly):
Yes, you do. > In the Wiki, I mention a package t3m, that, as much as I know, could > do the above computation. It could easily be made to do that, in those small cases where Haken's algorithm is feasible. However, in practice there are usually better ways involving quick methods of finding (some) Seifert surfaces combined with (twisted) Alexander polynomials to give lower bounds on the genus. > I don't know about visualisation, though. No, it doesn't do that. Best, Nathan --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
