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3-coloring triangle-free planar graphs
[2017 Discrete Math 세미나]
Date: 2017-03-07
Speaker : Bernard Lidicky (Iowa State University)
Abstract : A well known theorem of Grötzsch states that every planar graph is 3-colorable. We will show a simple proof based on a recent result of Kostochka and Yancey on the number of edges in 4-critical graphs. Then we show a strengthening of the Grötzsch’s theorem in several different directions. Based on joint works with Ilkyoo Choi, Jan Ekstein, Zdeněk Dvořák, Přemek Holub, Alexandr Kostochka, and Matthew Yancey.
Information Center for Mathematical Sciences KAIST
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