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Given a n-regular multigraph (multiple edges incident to the same two nodes are allowed), assume n is even. We try to assign each edge to one of its two end nodes, following a simple greedy rule: for each edge, check how many edges has been assigned to the two end nodes, and assign the edge to the end node with smaller edges. Breaking tie randomly.

Question: Assign the edges in arbitrary order, and each node will have n/2 edges assigned to them. Is it true or not? give proof or counter example.

I‘ve been stuck on this for days。 Thank you all for help!

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  • $\begingroup$ It's definitely false if n is odd. $\endgroup$ – Tony Huynh Jul 13 '11 at 20:17
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    $\begingroup$ Does look like homework. $\endgroup$ – Igor Rivin Jul 13 '11 at 22:31
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    $\begingroup$ Is this of interest to research mathematicians, as per the faq? I'm not convinced. Voting to close. $\endgroup$ – Gerry Myerson Jul 14 '11 at 5:15
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It is false for a $C_4$ or for a cube of any dimension. And it looks like homework.

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