English

Truncated Homogeneous Symmetric Functions

Combinatorics 2020-02-10 v1

Abstract

Extending the elementary and complete homogeneous symmetric functions, we introduce the truncated homogeneous symmetric function hλ\ddh_{\lambda}^{\dd} in (\refTHSF)(\ref{THSF}) for any integer partition λ\lambda, and show that the transition matrix from hλ\ddh_{\lambda}^{\dd} to the power sum symmetric functions pλp_\lambda is given by M(h\dd,p)=M(p,m)z1D\dd,M(h^{\dd},p)=M'(p,m)z^{-1}D^{\dd}, where D\ddD^{\dd} and zz are nonsingular diagonal matrices. Consequently, {hλ\dd}\{h_{\lambda}^{\dd}\} forms a basis of the ring Λ\Lambda of symmetric functions. In addition, we show that the generating function H\dd(t)=\ssumn0hn\dd(x)tnH^{\dd}(t)=\ssum_{n\ge 0}h_n^{\dd}(x)t^n satisfies ω(H\dd(t))=(H\dd(t))1,\omega(H^{\dd}(t))=\left(H^{\dd}(-t)\right)^{-1}, where ω\omega is the involution of Λ\Lambda sending each elementary symmetric function eλe_\lambda to the complete homogeneous symmetric function hλh_\lambda.

Keywords

Cite

@article{arxiv.2002.02784,
  title  = {Truncated Homogeneous Symmetric Functions},
  author = {Houshan Fu and Zhousheng Mei},
  journal= {arXiv preprint arXiv:2002.02784},
  year   = {2020}
}
R2 v1 2026-06-23T13:34:14.671Z