69 research outputs found
Automorphism groups of polycyclic-by-finite groups and arithmetic groups
Get PDFWe show that the outer automorphism group of a polycyclic-by-finite group is
an arithmetic group. This result follows from a detailed structural analysis of
the automorphism groups of such groups. We use an extended version of the
theory of the algebraic hull functor initiated by Mostow. We thus make
applicable refined methods from the theory of algebraic and arithmetic groups.
We also construct examples of polycyclic-by-finite groups which have an
automorphism group which does not contain an arithmetic group of finite index.
Finally we discuss applications of our results to the groups of homotopy
self-equivalences of K(\Gamma, 1)-spaces and obtain an extension of
arithmeticity results of Sullivan in rational homotopy theory
Wear characteristics of copper-based surface-level microcomposites and nanocomposites prepared by friction stir processing
Full text linkPROVIDING OF ACCURACYOF THE DEFORMATION CHARACTERISTICS MEASUREMENT
No full textIn the article there is shown that at measuring of deformation characteristics using strain gage the high accuracy is provided, which complies with requirements of testing standards
In situ high-temperature TEM observation of material escape from a surface of CoFeNi/Cu/ZrAlO composite into the amorphous carbon layer
Full text linkStructural transformations in (CoFeNi)/Ti nanocomposite systems during prolonged heating
Full text linkMechanical intermixing of elements and self-organization of (FeNi) and (CoFeNi) nanostructured composite layers on a Ti sheet under ball collisions
Full text linkMechanical intermixing of components in (CoMoNi)-based systems and the formation of (CoMoNi)/WC nanocomposite layers on Ti sheets under ball collisions
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Interatomic interactions and structural formations in WFeNi(Ti) and MoFeNi(Ti) layers under intense plastic deformation induced by ball collisions
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