Results 51 to 60 of about 212,076 (259)
Open Mathematics, 2015 In this paper three dimensional real hypersurfaces in non-flat complex space forms whose k-th Cho operator with respect to the structure vector field ξ commutes with the structure Jacobi operator are classified.
Panagiotidou Konstantina +1 more
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An elementary proof of MinVol(Rn) = 0 for n > 3
Anais da Academia Brasileira de Ciências, 2008 In this paper, we give an elementary proof of the result that the minimal volumes of R³ and R4 are zero. The approach is to construct a sequence of explicit complete metrics on them such that the sectional curvatures are bounded in absolute value by 1 ...
Jiaqiang Mei, Hongyu Wang, Haifeng Xu
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Introdução ao plano hiperbólico com o Geogebra [PDF]
, 2015 A Geometria Hiperbólica é uma das geometrias em que o famoso Postulado das Paralelas da Geometria Euclidiana não se verifica. Na geometria hiperbólica plana, por um ponto exterior a uma reta podem passar pelo menos duas paralelas à reta dada.
Maia, Cláudia, Vandembroucq, Lucile
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Mechanical Hamiltonization of Unreduced ϕ$\phi$‐Simple Chaplygin Systems
Studies in Applied Mathematics, Volume 154, Issue 5, May 2025.ABSTRACT In this paper, we prove that the trajectories of unreduced ϕ$\phi$‐simple Chaplygin kinetic systems are reparameterizations of horizontal geodesics with respect to a modified Riemannian metric. Furthermore, our proof is constructive and these Riemannian metrics, which are not unique, are obtained explicitly in interesting examples.
Alexandre Anahory Simoes +2 more
wiley +1 more source
Recent results on linear systems on generic K3 surfaces [PDF]
, 2004 In this note we relate about the problem of evaluate the dimension of linear systems through fat points defined on generic $K3$ surfaces.Comment: 4 pages ...
De Volder, Cindy, Laface, Antonio
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Zero‐curvature subconformal structures and dispersionless integrability in dimension five
Journal of the London Mathematical Society, Volume 110, Issue 6, December 2024.Abstract We extend the recent paradigm “Integrability via Geometry” from dimensions 3 and 4 to higher dimensions, relating dispersionless integrability of partial differential equations to curvature constraints of the background geometry. We observe that in higher dimensions on any solution manifold, the symbol defines a vector distribution equipped ...
Boris Kruglikov, Omid Makhmali
wiley +1 more source
Uma análise sobre a geometria nos livros didáticos e na provinha Brasil
Góndola, Enseñanza y Aprendizaje de las Ciencias, 2020 Este artigo traz resultados de uma pesquisa cujo objetivo foi investigar a coerência de conteúdos e formas na Geometria, presentes em três coleções de livros didáticos do 2º ano dos Anos Iniciais e na Provinha Brasil norteada pelos Parâmetros ...
Janaina Vasconcelos +2 more
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Geometry’s knowledge and teachers’ perspectives of the 1st basic education's cycle about its teaching [PDF]
, 2013 Este estudo foca o conhecimento de conteúdo de Geometria de professores do 1.º ciclo do ensino básico portugueses e as suas perspetivas sobre o ensino deste tema nos primeiros anos de escolaridade.
Almeida, Júlia +2 more
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Boundary Strichartz estimates and pointwise convergence for orthonormal systems
Transactions of the London Mathematical Society, Volume 11, Issue 1, December 2024.Abstract We consider maximal estimates associated with fermionic systems. Firstly, we establish maximal estimates with respect to the spatial variable. These estimates are certain boundary cases of the many‐body Strichartz estimates pioneered by Frank, Lewin, Lieb and Seiringer.
Neal Bez +2 more
wiley +1 more source
Looking up music in two ‘encyclopedias’ printed in 1501
Renaissance Studies, Volume 38, Issue 4, Page 563-594, September 2024.Abstract A modern user of a printed encyclopedia expects to find concise entries on a wide range of subjects organised alphabetically for ease of reference. In the fifteenth and sixteenth centuries a number of scholarly texts of a particularly long and wide‐ranging character were essentially ‘encyclopedized’ through the provision of compendious subject
Tim Shephard, Charlotte Hancock
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