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math.CO2026
Normal Ordering and Stirling-Type Combinatorics for Double Ore Extensions of Type (14641)
Andrés Rubiano
We develop an explicit PBW normal ordering theory for the double extension regular algebras of type in the Zhang-Zhang classification. With respect to the order $x_1…
math.CO2026
Combinatorial aspects of normal ordering of 3-dimensional skew polynomial rings
Andrés Rubiano, Armando Reyes
In this paper, we discuss combinatorial aspects of normal ordering of 3-dimensional skew polynomial rings defined and classified by Bell and Smith \cite{BellSmith1990}. With some h…