New approach to λ-Stirling numbers

Abstract

The aim of this paper is to study the $ \lambda $-Stirling numbers of both kinds, which are $ \lambda $-analogues of Stirling numbers of both kinds. These numbers have nice combinatorial interpretations when $ \lambda $ are positive integers. If $ \lambda = 1 $, then the $ \lambda $-Stirling numbers of both kinds reduce to the Stirling numbers of both kinds. We derive new types of generating functions of the $ \lambda $-Stirling numbers of both kinds which are related to the reciprocals of the generalized rising factorials. Furthermore, some related identities are also derived from those generating functions. In addition, all the corresponding results to the $ \lambda $-Stirling numbers of both kinds are obtained for the $ \lambda $-analogues of $ r $-Stirling numbers of both kinds, which are generalizations of those numbers.

Keywords

• $ \lambda $-stirling numbers of the first kind
• $ \lambda $-stirling numbers of the second kind
• $ \lambda $-analogues of $ r $-stirling numbers of the first kind
• $ \lambda $-analogues of $ r $-stirling numbers of the second kind
• $ \lambda $-analogues of binomial coefficients