Shape Avoiding Permutations
โ Scribed by Ron M. Adin; Yuval Roichman
- Book ID
- 102586732
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 121 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0097-3165
No coin nor oath required. For personal study only.
โฆ Synopsis
Permutations avoiding all patterns of a given shape (in the sense of Robinson, Schensted, and Knuth) are considered. We show that the shapes of all such permutations are contained in a suitable thick hook and deduce an exponential growth rate for their number.
๐ SIMILAR VOLUMES
We study generating functions for the number of permutations on n letters avoiding 132 and an arbitrary permutation ฯ on k letters, or containing ฯ exactly once. In several interesting cases the generating function depends only on k and is expressed via Chebyshev polynomials of the second kind.
We consider permutations of a multiset which do not contain certain ordered patterns of length 3. For each possible set of patterns we provide a structural description of the permutations avoiding those patterns, and in many cases a complete enumeration of such permutations according to the underlyi