Residual Properties of Nilpotent Groups
Let π be a set of primes. Recall that a group G is said to be a residually finite π-group if for every nonidentity element a of G there exists a homomorphism of the group G onto some finite π-group such that the image of the element a differs from 1. A group G will be said to be a virtually residual...
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| Format: | Article |
| Language: | English |
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Yaroslavl State University
2015-04-01
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| Series: | Моделирование и анализ информационных систем |
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| Online Access: | https://www.mais-journal.ru/jour/article/view/237 |
| Summary: | Let π be a set of primes. Recall that a group G is said to be a residually finite π-group if for every nonidentity element a of G there exists a homomorphism of the group G onto some finite π-group such that the image of the element a differs from 1. A group G will be said to be a virtually residually finite π-group if it contains a finite index subgroup which is a residually finite π-group. Recall that an element g in G is said to be π-radicable if g is an m-th power of an element of G for every positive π-number m. Let N be a nilpotent group and let all power subgroups in N are finitely separable. It is proved that N is a residually finite π-group if and only if N has no nonidentity π-radicable elements. Suppose now that π does not coincide with the set Π of all primes. Let π 0 be the complement of π in the set Π. And let T be a π 0 component of N i.e. T be a set of all elements of N whose orders are finite π 0 -numbers. We prove that the following three statements are equivalent: (1) the group N is a virtually residually finite π-group; (2) the subgroup T is finite and quotient group N/T is a residually finite π-group; (3) the subgroup T is finite and T coincides with the set of all π-radicable elements of N. |
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| ISSN: | 1818-1015 2313-5417 |