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Feb 11, 2014 at 10:24 answer added Ben Barber timeline score: 2
Feb 10, 2014 at 17:13 history edited user9072
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Jun 7, 2011 at 23:53 comment added Turbo Could you please provide a reference as well?
Jun 7, 2011 at 23:49 comment added Turbo I think you can post it as an answer!!
Jun 7, 2011 at 23:46 comment added Chris Godsil It's an easy exercise to show that if $B$ is simple and bipartite and embeds in an orientable surface of genus $g$ then $$ |E(B)| \le 2|V(B)| - 4 + 4g $$ and equality holds if and only if each face has degree four.
Jun 7, 2011 at 22:09 history asked Turbo CC BY-SA 3.0