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math.CO2023★ 1 cited
Planar Turán number of the 7-cycle
Ruilin Shi, Zach Walsh, Xingxing Yu
The of a graph is the maximum number of edges in an -vertex planar graph without as a subgraph. Let $C_{\e…
math.CO2023
Matroid lifts and representability
Daniel Irving Bernstein, Zach Walsh
A 1965 result of Crapo shows that every elementary lift of a matroid can be constructed from a linear class of circuits of . In a recent paper, Walsh generalized this constr…