21 citations · 23 across the 4 of their papers we have counts for
4 papers
Shape-Wilf-ordering of permutations of length 3
Zvezdelina Stankova
The research on pattern-avoidance has yielded so far limited knowledge on Wilf-ordering of permutations. The Stanley-Wilf limits sqrt[n](|S_n(tau)|) and further works suggest asymp…
321-polygon-avoiding permutations and Chebyshev polynomials
T. Mansour, Z. Stankova
A 321-k-gon-avoiding permutation pi avoids 321 and the following four patterns: k(k+2)(k+3)...(2k-1)1(2k)23...(k+1), k(k+2)(k+3)...(2k-1)(2k)123...(k+1), (k+1)(k+2)(k+3)...(2k-1)1(…
Explicit Enumeration of 321,Hexagon-Avoiding Permutations
Zvezdelina Stankova-Frenkel, Julian West
The 321,hexagon-avoiding (321-hex) permutations were introduced and studied by Billey and Warrington in as a class of elements of S_n whose Kazhdan-Lusztig and Poincare polynomials…
A New Class of Wilf-Equivalent Permutations
Zvezdelina Stankova-Frenkel, Julian West
For about 10 years, the classification of permutation patterns was thought completed up to length 6. In this paper, we establish a new class of Wilf-equivalent permutation patterns…