The Sprugnoli group is a new group of lower-triangular matrices defined by three power series that generalizes the Riordan and double Riordan groups.
Sprugnoli, Riordan array proofs of identities in Gould’s book, Preprint, University of Florence, Italy
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A new group in the Riordan family of matrix groups: the Sprugnoli group
The Sprugnoli group is a new group of lower-triangular matrices defined by three power series that generalizes the Riordan and double Riordan groups.