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- University of GothenburgSE49 papers
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Showing 2002 · math.COShow all
3 papers · 2 filters
math.CO2002
Restricted 132-alternating permutations and Chebyshev polynomials
T. Mansour
A permutation is said to be \emph{alternating} if it starts with rise and then descents and rises come in turn. In this paper we study the generating function for the number of alt…
math.CO2002
Partially Ordered generalized patterns and k-ary words
S. Kitaev, T. Mansour
Recently, Kitaev [Ki2] introduced partially ordered generalized patterns (POGPs) in the symmetric group, which further generalize the generalized permutation patterns introduced by…
math.CO2002★ 6 cited
There are no iterated morphisms that define the Arshon sequence and the -sequence
Sergey Kitaev
Berstel proved that the Arshon sequence cannot be obtained by iteration of a morphism. An alternative proof of this fact is given here. The -sequence was constructed by Evdokimo…