Results 131 to 140 of about 5,426 (162)

Characterisation of Large-Sized REBaCuO Bulks for Application in Flux Modulation Machines. [PDF]

open access: yesMaterials (Basel)
Nouailhetas Q   +9 more
europepmc   +1 more source

Techno-structural and 3-D geometric morphometric analysis applied for investigating the variability of Holocene unifacial tools in tropical Central Brazil. [PDF]

open access: yesPLoS One
González-Varas M   +9 more
europepmc   +1 more source

Homotheties of Finsler manifolds

open access: yesHomotheties of Finsler manifolds
openaire  

Homothety groups in space-time

General Relativity and Gravitation, 1990
The authors investigate Lorentzian space-times which admit an r- dimensional Lie algebra of homothetic vector fields at least one of which is proper homothetic (i.e., it is not a Killing vector field). A complete description of the situation is obtained if \(r\geq 6\) and some results are given for \(r\leq 5\).
Hall, G. S., Steele, J. D.
openaire   +1 more source

On minkowski planes with transitive groups of homotheties

Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg, 1994
In analogy with the well-known Lenz-Barlotti classification of projective planes, there are the Hering classification of Möbius planes [\textit{C. Hering}, Math. Z. 87, 252-262 (1965; Zbl 0126.166)], the Kleinewillinghofer classification of Laguerre planes [\textit{R. Kleinewillinghofer}, Arch. Math.
Klein, M., Kroll, H.-J.
openaire   +1 more source

Simply-transitive homothety groups

General Relativity and Gravitation, 1991
The author uses the spin-coefficient formalism of Penrose and Rindler to obtain spacetimes admitting a simply-transitive group of homotheties. Vacuum metrics with a five-dimensional homothety group are also considered.
openaire   +2 more sources

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