Results 1 to 10 of about 1,040 (166)
Homothety curvature homogeneity and homothety homogeneity [PDF]
Annals of Global Analysis and Geometry, 2015 This article supersedes arXiv:1309 ...
Eduardo Garcia-Rio +2 more
exaly +4 more sources
A gametheoretic approach for non-uniform pole shifting and pole homothety [PDF]
Automatica, 2013 This paper investigates the problems of non-uniform pole shifting or pole homothety in multivariable linear systems by using a gametheoretic approach and more specifically a particular Nash strategy with an open-loop information structure for a game including a time preference rate in the quadratic criteria.
Marc Jungers +2 more
exaly +3 more sources
Some Properties of Ruled Surfaces under Homothety in E3 [PDF]
Mathematical and Computational Applications, 2002 It is clearly that, If f : E3→E3 is a homothety and \(\varphi\) is a surface in three dimensional Euclidean space E3, \(f(\varphi) = \overline{\varphi}\) is also a surface in E3.
Emin Kasap, Salim Yüce
exaly +5 more sources
Design and implementation of a task sequence for teaching homothety
Eurasia Journal of Mathematics, Science and Technology EducationThe teaching of geometry in Chile faces several challenges, as evidenced by the low performance of students in international assessments. In particular, the concept of homothety is impacted by teaching methodologies that emphasize rote memorization and ...
Paula Verdugo Hernández
exaly +3 more sources
Formalism for spacetimes with a homothety
Classical and Quantum Gravity, 2002 In this paper, the formalism developed by Fayos and Sopuerta for the study of spacetimes admitting a Killing vectors is generalized in three ways: the case of homothetic vector is covered, the tetrad is not assumed to be aligned with the (homothetic) bivector and the tetrad is not assumed to be normalized.
J. D. Steele
exaly +4 more sources
Singularities and homothety groups in spacetime
Classical and Quantum Gravity, 1988 Some inaccuracies in the article of \textit{C. B. Collins} and \textit{J. M. Lang} in ibid. 3, 1143-1150 (1986; Zbl 0604.53045)] are corrected and commented here leading to a more general version of the main result given there.
G. Hall
exaly +4 more sources
Interferometric apodization by homothety – II. Experimental validation [PDF]
Monthly Notices of the Royal Astronomical Society, 2023 This work presents the results of experimental laboratory tests on the apodization of circular and rectangular apertures using the Interferometric Apodization by Homothety (IAH) technique.
J. Chafi +6 more
semanticscholar +3 more sources
Interferometric apodization by homothety – I. Optimization of the device parameters [PDF]
Monthly Notices of the Royal Astronomical Society, 2023 This study is focused on the very high dynamic imaging field, specifically the direct observation of exoplanetary systems. The coronagraph is an essential technique for suppressing the star’s light, making it possible to detect an exoplanet with a very
J. Chafi +6 more
semanticscholar +3 more sources
All vacuum Bianchi I metrics with a homothety
Classical and Quantum Gravity, 1991 All vacuum metrics with a four-parameter homothety group containing a three-dimensional Abelian subgroup are found. These include the Kasner family of metrics, metrics related to the Kasner family by complex transformations (which include a family of vacuum metrics found by Lewis in 1932 and a metric found by Petrov in 1962 to be the only vacuum metric
C. Mcintosh, J. D. Steele
exaly +4 more sources
A Tablet App for Handwriting Skill Screening at the Preliteracy Stage: Instrument Validation Study [PDF]
JMIR Serious Games, 2020 BackgroundDifficulties in handwriting, such as dysgraphia, impact several aspects of a child’s everyday life. Current methodologies for the detection of such difficulties in children have the following three main weaknesses: (1) they are prone to ...
Dui, Linda Greta +6 more
doaj +2 more sources