2 papers
math.CO2026
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.CO2026
Pin Classes I: Growth Rates
Ben Jarvis
Pin sequences play an important role in the structural study of permutation classes. In this paper, we study the permutation classes that comprise all the finite subpermutations co…