Gergen Lectures Seminar
Wednesday, March 5, 2014, 4:30pm, Physics 128
Laszlo Lovasz (Eötvös Loránd University)
Graph limits and extremal graph theory
Abstract:
Many questions in extremal graph theory can be phrased like this: what is the maximum of a certain linear combination of densities of given graphs in any graph G? Answers to such questions are often very difficult. Graph limits make it possible to pose and in some cases answer some general questions about extremal graphs: Which inequalities between subgraph densities are valid? Can all valid inequalities be proved using just Cauchy-Schwarz? Is there always an extremal graph? Which graphs are extremal?

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