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math.GR2022★ 1 cited
On derived-indecomposable solutions of the Yang--Baxter equation
Ilaria Colazzo, Maria Ferrara, Marco Trombetti
If is a finite non-degenerate set-theoretic solution of the Yang--Baxter equation, the additive group of the structure skew brace is an -group, i.e. a group wh…
math.LO2022
A note on the series' of ordinal numbers
Marco Trombetti
The aim of this short note is to provide a proof to a statement of Sierpiński concerning the number of possible sums of a series (of type ) of arbitrary ordinal numbers…