A Proof of a Conjecture of Ohba Jonathan A. Noel, Bruce A. Reed, Hehui Wu August 1, 2012 Abstract We prove a conjecture of Ohba which says that every graph G on at most 2χ(G) + 1 vertices satisfies χ` (G) = χ(G).
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A Proof of a Conjecture of Ohba Jonathan A. Noel, Bruce A. Reed, Hehui Wu August 1, 2012 Abstract We prove a conjecture of Ohba which says that every graph G on at most 2χ(G) + 1 vertices satisfies χ` (G) = χ(G).