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math.CO2024
Pin classes II: Small pin classes
Robert Brignall, Ben Jarvis
Pin permutations play an important role in the structural study of permutation classes, most notably in relation to simple permutations and well-quasi-ordering, and in enumerative…
math.CO2024
On cycles in monotone grid classes of permutations
David Bevan, Robert Brignall, Nik Ruškuc
We undertake a detailed investigation into the structure of permutations in monotone grid classes whose row-column graphs do not contain components with more than one cycle. Centra…