Unavoidable dense induced subgraphs

Series
Graph Theory Seminar
Time
Tuesday, September 8, 2020 - 3:45pm for 1 hour (actually 50 minutes)
Location
https://bluejeans.com/681348075/???? (replace ???? with password). For password, please email Anton Bernshteyn (bahtoh~at~gatech.edu)
Speaker
Rose McCarty – University of Waterloo – rose.mccarty@uwaterloo.cahttps://www.math.uwaterloo.ca/~rmmccart/
Organizer
Anton Bernshteyn

Thomassen conjectures that every graph of sufficiently large average degree has a subgraph of average degree at least d and girth at least k, for any d and k. What if we want the subgraph to be induced? Large cliques and bicliques are the obvious obstructions; we conjecture there are no others. We survey results in this direction, and we prove that every bipartite graph of sufficiently large average degree has either K_{d,d} or an induced subgraph of average degree at least d and girth at least 6.