Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
sci.math.*
»
sci.math
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
A topological problem
Replies:
6
Last Post:
Mar 2, 2013 9:39 AM




Re: A topological problem
Posted:
Feb 27, 2013 8:15 AM


Ken Pledger <ken.pledger@vuw.ac.nz> wrote:
> Can you move a crossing past an o? If so, the thing is a planar > graph: just move the four corner o's, top to bottom and bottom to top.
> That fulfils your condition about horizontal lines. But is there some > other restriction on moving the crossings?
Oh. Sorry. The o are nailed to the plane and may not be moved. (You can move the O, though.)  Hauke Reddmann <:EX8 fc3a501@unihamburg.de Die Weltformel: IQ+dB=const.



