Koruoğlu, Ö .; Meral, T.; Sahin, R.(ДЗ "ЛНУ імені Тараса Шевченка", 2019)

Let p, q > 2 be relatively prime integers and
let Hp,q be the generalized Hecke group associated to p and q. The
generalized Hecke group Hp,q is generated by X(z) = −(z − λp)−1
and Y (z) = −(z + λq) −1 where λp = 2 cos ...

Kurdachenko, L. A.; Subbotin, I. Ya.(Луганский национальный университет им. Т. Шевченко, 2005)

Some properties of abnormal subgroups in generalized soluble groups are considered. In particular, the transitivity of abnormality in metahypercentral groups is proven. Also it is
proven that a subgroup H of a radical ...

We investigate groups in which maximal sub-
groups of even order are primary or biprimary. We also research
soluble groups with restriction on a number of prime devisors of some
proper subgroup orders. We give ...