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math.AC2025
On Riordan groups involving formal semi-Laurent series and their Lie group structure
Dariusz Bugajewski, Dawid Bugajewski, Xiao-Xiong Gan +1
The main goal of this paper is to introduce and to investigate properties of generalized Riordan arrays and generalized Riordan groups that involve formal semi-Laurent series. In p…
math.AC2025
A note on multiplicative roots of multivariable formal power series
Piotr MaÄkowiak, Motaz Mokatren
Suppose that we are given a formal power series of many variables with coefficients in (or ) and we want to compute its -th (multiplicative) root. As ca…