Symmetry and unimodality in \(t\)-stack sortable permutations (Q1601431)
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scientific article; zbMATH DE number 1760677
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Symmetry and unimodality in \(t\)-stack sortable permutations |
scientific article; zbMATH DE number 1760677 |
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Symmetry and unimodality in \(t\)-stack sortable permutations (English)
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28 April 2003
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The author considers the sequence \(W_t(n,k)\) of the numbers of \(t\)-stack sortable permutations with \(k\) descents. The proof is constructive and shows that \(W_t(n,k)\) is symmetric and unimodal.
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combinatorics
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permutations
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