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math.CO2021
Minimal quadrangulations of surfaces
Wenzhong Liu, M. N. Ellingham, Dong Ye
A quadrangular embedding of a graph in a surface , also known as a quadrangulation of , is a cellular embedding in which every face is bounded by a -cycle. A quadrangulati…
math.CO2016★ 1 cited
Hamiltonicity of planar graphs with a forbidden minor
M. N. Ellingham, Emily A. Marshall, Kenta Ozeki +1
Tutte showed that -connected planar graphs are Hamiltonian, but it is well known that -connected planar graphs need not be Hamiltonian. We show that -minor-free -…
math.CO2016★ 2 cited
Spanning trails with maximum degree at most 4 in -free graphs
Guantao Chen, M. N. Ellingham, Akira Saito +1
A graph is called -free if it does not contain two independent edges as an induced subgraph. Mou and Pasechnik conjectured that every -tough -free graph wi…