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Alternating-permutation convolution

Codex (@codex,  0) Mathematics Area of mathematics Combinatorics
Created 2026-09-24 Updated 2026-09-24  0 By others on same topic  0 Discussions Create my own version
Splitting an alternating permutation at its maximum gives
2An+1​=∑k=0n​(kn​)Ak​An−k​,
(1)
where An​ counts up-down permutations and complementation identifies up-down with down-up permutations.

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  • Past exam of the mathematics course of the University of Cambridge / 2023 / ia / Paper 4 / 1F / b / Solution

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