3 papers
math.CO2020
Truncated Homogeneous Symmetric Functions
Houshan Fu, Zhousheng Mei
Extending the elementary and complete homogeneous symmetric functions, we introduce the truncated homogeneous symmetric function $h_λ^{\dd}$ in $(\ref{THSF})$ for any integer parti…
math.CO2018
Pattern Avoidance of Generalized Permutations
Zhousheng Mei, Suijie Wang
In this paper, we study pattern avoidances of generalized permutations and show that the number of all generalized permutations avoiding is independent of the choice of $π\in S…
math.CO2017
Order Preserving Maps of Posets
Zhousheng Mei, Suijie Wang
For any two finite posets and , let $\Hom(P,Q)$ be the hom-poset consisting of all order preserving maps from to , and the collection of all order ideals of $Q…