Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Nowhere-zero flows and coloring of planar graphs are related by duality. (wiki) I heard that there was a similar relation for nowhere-zero flows in signed graphs and colorings of some other graphs. I can't seem to find it. Can somebody say what the relation is and maybe also explain it?

share|cite|improve this question
    
I do not recall seeing any duality type relation between flows and colourings in general graphs. – Chris Godsil May 18 '14 at 21:32
    
Sorry, I see that I left out an important word: edited! – bart_m8 May 19 '14 at 5:34
    
I think you might be referring to colourings of graphs embedded in the projective plane. – nvcleemp May 19 '14 at 6:57
    
Yes, I think that was it: embedded in the projective plasne. – bart_m8 May 19 '14 at 19:58

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.