Generalizations of Two-stack-sortable Permutations
Год выпуска: 2010 Автор: Dapeng Xu Издательство: LAP Lambert Academic Publishing Страниц: 64 ISBN: 9783838306216 Описание This is a dissertation presented to the faculty of department of mathematics, Brandeis University, in partial fulfillment of the requirements for the degree Doctor of Philosophy. In this thesis, we apply the stack sorting operator to r-permutations and construct the functional equation for the generating function of two-stack-sortable permutations counted by descents by using a factorization similar to Zeilberger''s. We solve the functional equation and give explicit formulas for the number of two-stack-sortable permutations.
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