Showing math.COShow all
2 papers · 1 filter
math.CO2011
Pattern avoidance by even permutations
Andrew M. Baxter, Aaron D. Jaggard
We study questions of even-Wilf-equivalence, the analogue of Wilf-equivalence when attention is restricted to pattern avoidance by permutations in the alternating group. Although s…
math.CO2009
Applying the Cluster Method to Count Occurrences of Generalized Permutation Patterns
Andrew M. Baxter
We apply ideas from the cluster method to q-count the permutations of a multiset according to the number of occurrences of certain generalized patterns, as defined by Babson and St…