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math.CO2026
Matchings and shape-Wilf-Equivalence of sets of patterns of length three II: Quadruples and Quintuples
Sucharita Biswas, Umesh Shankar, Sivaramakrishnan Sivasubramanian
Building on our classification of shape-Wilf-equivalence classes for triples of patterns of length three, we complete the classification for quadruples and quintuples. The larger p…
math.CO2026
Matchings and shape-Wilf-Equivalence of sets of patterns of length three I: Triples
Sucharita Biswas, Umesh Shankar, Sivaramakrishnan Sivasubramanian
Permutation pattern avoidance on Ferrers boards has become a central topic in enumerative combinatorics with important connections to matchings, set partitions, and other combinato…