
We show that the Eulerian-Catalan numbers enumerate Dyck permutations. We provide two proofs for this fact, the first using the geometry of alcoved polytopes and the second a direct combinatorial proof via an Eulerian-Catalan analogue of the Chung-Feller theorem.
FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO)
FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO)
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