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On automorphisms fixing subnormal subgroups of soluble groups

Silvana Franciosi, Francesco de Giovanni (1988)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

The group A u t s n G of all automorphisms leaving invariant every subnormal subgroup of the group G is studied. In particular it is proved that A u t s n G is metabelian if G is soluble, and that A u t s n G is either finite or abelian if G is polycyclic.

On Balancing and Lucas-balancing Quaternions

Bijan Kumar Patel, Prasanta Kumar Ray (2021)

Communications in Mathematics

The aim of this article is to investigate two new classes of quaternions, namely, balancing and Lucas-balancing quaternions that are based on balancing and Lucas-balancing numbers, respectively. Further, some identities including Binet's formulas, summation formulas, Catalan's identity, etc. concerning these quaternions are also established.

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