E. Y. Deng

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math.CO2009★ 4 cited

The Riordan Group and Symmetric Lattice Paths

Li-Hua Deng, Eva Y. P. Deng, Louis W. Shapiro

In this paper, we study symmetric lattice paths. Let $d_{n}$ , $m_{n}$ , and $s_{n}$ denote the number of symmetric Dyck paths, symmetric Motzkin paths, and symmetric Schröder paths…

math.CO2008

Symmetric Schroder paths and restricted involutions

Eva Y. P. Deng, Mark Dukes, Toufik Mansour +1

Let $A_{k}$ be the set of permutations in the symmetric group $S_{k}$ with prefix 12. This paper concerns the enumeration of involutions which avoid the set of patterns $A_{k}$ . We prese…