A new class of multiset Wilf equivalent pairs Original Research Article

We say the pair of patterns image is multiset Wilf equivalent if, for any multiset M, the number of permutations of M that avoid image is equal to the number of permutations of M that avoid image. In this paper, we find a large new class of multiset Wilf equivalent pairs, namely, the pair (image, image), for image and image a permutation of image. It is the most general multiset Wilf equivalence result to date.