We consider, in rings of formal power series, the series whose coefficients, in a certain sense, “tends to infinity”. In this manner, we determine subrings of the rings as above, which have several derivations. Some of these subrings are composition rings also. At first, we study direct products of groupoids.
Subgroupoids of some direct products and formal power series / G., Gallina; Morini, Fiorenza. - In: BEITRAGE ZUR ALGEBRA UND GEOMETRIE. - ISSN 0138-4821. - 56:2(2015), pp. 387-396. [10.1007/s13366-014-0191-9]
Subgroupoids of some direct products and formal power series
MORINI, Fiorenza
2015-01-01
Abstract
We consider, in rings of formal power series, the series whose coefficients, in a certain sense, “tends to infinity”. In this manner, we determine subrings of the rings as above, which have several derivations. Some of these subrings are composition rings also. At first, we study direct products of groupoids.File in questo prodotto:
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