2 papers
math.OC2025
Quasi-difference-convexity: Modernization of Quasi-differentiable Optimization
Jong-Shi Pang, Yulin Peng
Quasi-differentiable functions were introduced by Pshenichnyi in a 1969 monograph written in Russian and translated in an English version in 1971. This class of nonsmooth functions…
math.CO2024
The monoid representation of upho posets and total positivity
Ziyao Fu, Yulin Peng, Yuchong Zhang
We show that all totally positive formal power series with integer coefficients and constant term are precisely the rank-generating functions of Schur-positive upho posets, the…