Results 61 to 70 of about 48,794 (204)

Groups Factorized by Pairwise Permutable Abelian Subgroups of Finite Rank [PDF]

open access: yesAdvances in Group Theory and Applications, 2016
It is proved that a group which is the product of pairwise permutable abelian subgroups of finite Prüfer rank is hyperabelian with finite Prüfer rank; in the periodic case the Sylow subgroups of such a product are described.
Bernhard Amberg, Yaroslav P. Sysak
doaj   +1 more source

[Translated article] A 3D method to estimate the effect of derotational osteotomies over femoral maltorsion

open access: yesRevista Española de Cirugía Ortopédica y Traumatología, 2022
Introduction and objectives: Accurate measurement of femoral torsion is essential to diagnosing, correct surgical decision-making, and the preoperative planning of derotational osteotomies in a subgroup of anterior knee pain patients and patellofemoral ...
J. Ferràs-Tarragó   +4 more
doaj   +1 more source

General relativity as a biconformal gauge theory

open access: yesNuclear Physics B, 2019
We consider the conformal group of a space of dimn=p+q, with SO(p,q) metric. The quotient of this group by its homogeneous Weyl subgroup gives a principal fiber bundle with 2n-dim base manifold and Weyl fibers.
James T. Wheeler
doaj   +1 more source

A note on torsion-free locally cyclic quasinormal subgroups [PDF]

open access: yesJournal of Algebra, 2015
A subgroup \(H\) of a group \(G\) is said to be \textit{quasinormal} if \(HX=XH\) for all subgroups \(X\) of \(G\). A well-known theorem by \textit{R. Maier} and \textit{P. Schmid} [Math. Z. 131, 269-272 (1973; Zbl 0259.20017)] shows that every core-free quasinormal subgroup of a finite group \(G\) lies in the hypercentre of \(G\). This result fails to
CUTOLO, GIOVANNI, LEONE, ANTONELLA
openaire   +1 more source

Structure of Finite-Dimensional Protori

open access: yesAxioms, 2019
A Structure Theorem for Protori is derived for the category of finite-dimensional protori (compact connected abelian groups), which details the interplay between the properties of density, discreteness, torsion, and divisibility within a finite ...
Wayne Lewis
doaj   +1 more source

Hip MRI in flexion abduction external rotation for assessment of the ischiofemoral interval in patients with hip pain—a feasibility study

open access: yesInsights into Imaging, 2023
Objectives To assess the feasibility of flexion-abduction-external rotation (FABER) magnetic resonance imaging (MRI) of the hip to visualize changes in the ischiofemoral interval and ability to provoke foveal excursion over the acetabular rim.
Alexander F. Heimann   +10 more
doaj   +1 more source

Entropy in a category

open access: yes, 2011
The Pinsker subgroup of an abelian group with respect to an endomorphism was introduced in the context of algebraic entropy. Motivated by the nice properties and characterizations of the Pinsker subgroup, we generalize its construction in two directions.
Bruno, Anna Giordano, Dikranjan, Dikran
core   +1 more source

Visual intraoperative estimation of cup and stem position is not reliable in minimally invasive hip arthroplasty

open access: yesActa Orthopaedica, 2016
Background and purpose — In hip arthroplasty, acetabular inclination and anteversion—and also femoral stem torsion—are generally assessed by eye intraoperatively. We assessed whether visual estimation of cup and stem position is reliable.
Michael Woerner   +7 more
doaj   +1 more source

Curvature and torsion pseudotensors of coaffine connection in tangent bundle of hypercentred planes manifold

open access: yesДифференциальная геометрия многообразий фигур, 2020
The hypercentered planes family, whose dimension coincides with dimension of generating plane, is considered in the projective space. Two principal fiber bundles arise over it.
A.V. Vyalova
doaj   +1 more source

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