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Profinite completions of orientable Poincare duality groups of dimension four and Euler characteristic zero
(European Mathematical SocZurichSuíça, 2009)
Spin clusters inside four young asteroid groups
(Oxford Univ Press, 2020-04-01)
Asteroid groups may either form because of collisions or because of spin induced fission. Recently it has been shown that young spin clusters tend to form more frequently in young collisional families than in older groups. ...
On the Isometry Groups of Invariant Lorentzian Metrics on the Heisenberg Group
(Birkhauser Verlag Ag, 2014-01)
This work concerns the invariant Lorentzian metrics on the Heisenberg Lie group of dimension three H3(R) and the bi-invariant metrics on the solvable Lie groups of dimension four. We start with the indecomposable Lie groups ...
Kinematics of a spacetime with an infinite cosmological constant
(Kluwer Academic/plenum Publ, 2003-04-01)
A solution of the sourceless Einstein's equation with an infinite value for the cosmological constant L is discussed by using Inonu-Wigner contractions of the de Sitter groups and spaces. When Lambda --> infinity, spacetime ...
Biomechanical Comparison Of Four Mandibular Angle Fracture Fixation Techniques
(THIEME MEDICAL PUBL INCNEW YORK, 2015)
Describing all bi-orderings on Thompson’s group F
(2009)
We describe all possible ways of bi-ordering Thompson’s group F: its space of bi-orderings is
made up of eight isolated points and four canonical copies of the Cantor set.
Treatment times of Class II malocclusion: four premolar and non-extraction protocols
(OXFORD UNIV PRESSOXFORD, 2012)
The purpose of this study was to retrospectively compare the treatment times of Class II division 1 malocclusion subjects treated with four first premolar extractions or a non- extraction protocol and fixed edgewise ...
Synthesis of New Pentaerythritol-Based Gemini Surfactants
(Georg Thieme Verlag Kg, 2001-06)
New dimeric or gemini surfactants bearing double-chain with two or four sulfonate groups, and quadruple-chain with four sulfonate groups, were prepared from pentaerythritol in good overall yields. All these surfactants ...