45 citations · 126 across the 9 of their papers we have counts for
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math.CO2023
Positivity problem of three-term recurrence sequences
Yanni Pei, Yaling Wang, Yi Wang
We present some necessary and/or sufficient conditions for the positivity problem of three-term recurrence sequences. As applications we show the positivity of diagonal Taylor coef…
math.CO2022
Counting derangements with signed right-to-left minima and excedances
Yanni Pei, Jiang Zeng
Recently Alexandersson and Getachew proved some multivariate generalizations of a formula for enumerating signed excedances in derangements. In this paper we first relate their wor…