Results 11 to 20 of about 218,992 (317)

On Periodic Groups of Shunkov with the Chernikov Centralizers of Involutions

open access: yesИзвестия Иркутского государственного университета: Серия "Математика", 2020
Layer-finite groups first appeared in the work by S.~N.~Chernikov (1945). Almost layer-finite groups are extensions of layer-finite groups by finite groups.
V.I. Senashov
doaj   +1 more source

Properties of groups with points [PDF]

open access: yesIranian Journal of Numerical Analysis and Optimization, 2009
In this paper, we consider groups with points which were introduced by V.P. Shunkov in 1990. In Novikov-Adian's group, Adian's periodic products of finite groups without involutions and Olshansky's periodic monsters every non-unit element is a point ...
V.I. Senashov, E.N. Takovleva
doaj   +1 more source

Some classes of minimally almost periodic topological groups

open access: yesApplied General Topology, 2015
A Hausdorff topological group G=(G,T) has the small subgroup generating property (briefly: has the SSGP property, or is an SSGP group) if for each neighborhood U of $1_G$ there is a family $\sH$ of subgroups of $G$ such that $\bigcup\sH\subseteq U$ and $\
Wistar Comfort, Franklin R. Gould
doaj   +1 more source

Almost periodic transformation groups [PDF]

open access: yesTransactions of the American Mathematical Society, 1937
1. In view of the recent work on topological groups it is natural to consider the situation which arises when such groups act as transformation groups on various types of spaces. Such a study is begun here from the point of view of almost periodic transformation groups, the definition of which is suggested by von Neumann's paper on almost periodic ...
openaire   +2 more sources

Beta to theta power ratio in EEG periodic components as a potential biomarker in mild cognitive impairment and Alzheimer’s dementia

open access: yesAlzheimer’s Research & Therapy, 2023
Background Alzheimer’s dementia (AD) is associated with electroencephalography (EEG) abnormalities including in the power ratio of beta to theta frequencies.
Hamed Azami   +14 more
doaj   +1 more source

Frequent periodic leg movement during sleep is an unrecognized risk factor for progression of atrial fibrillation. [PDF]

open access: yesPLoS ONE, 2013
Sleep apnea has been recognized as a factor predisposing to atrial fibrillation recurrence and progression. The effect of other sleep-disturbing conditions on atrial fibrillation progression is not known.
Mahek Mirza   +9 more
doaj   +1 more source

Periodic solutions of second order Hamiltonian systems with nonlinearity of general linear growth

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2021
In this paper we consider a class of second order Hamiltonian system with the nonlinearity of linear growth. Compared with the existing results, we do not assume an asymptotic of the nonlinearity at infinity to exist. Moreover, we allow the system to be
Guanggang Liu
doaj   +1 more source

Clifford periodicity from finite groups [PDF]

open access: yesJournal of Physics A: Mathematical and General, 1999
8 pages ...
Boya, Luis J., Byrd, Mark
openaire   +3 more sources

Almost periodic functions, constructively [PDF]

open access: yesLogical Methods in Computer Science, 2005
The almost periodic functions form a natural example of a non-separable normed space. As such, it has been a challenge for constructive mathematicians to find a natural treatment of them.
Bas Spitters
doaj   +1 more source

Periodic Algebras Generated by Groups [PDF]

open access: yesAlgebra Colloquium, 2015
We consider algebras with basis numerated by elements of a group G. We fix a function f from G × G to a ground field and give a multiplication of the algebra which depends on f. We study the basic properties of such algebras. In particular, we find a condition on f under which the corresponding algebra is a Leibniz algebra.
Albeverio, S.   +2 more
openaire   +3 more sources

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