Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Oscar PALMAS"'
Publikováno v:
International Electronic Journal of Geometry. 16:304-333
A null manifold is a differentiable manifold M endowed with a degenerate metric tensor g. In this work we provide sufficient conditions for a null manifold to be isometrically immersed as a hypersurface into a simple connected semi-Riemannian manifol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84e23d822d59426b03dcdabfe9dc826c
https://doi.org/10.36890/iejg.1274307
https://doi.org/10.36890/iejg.1274307
Autor:
A. Gervasio Colares, Oscar Palmas
Publikováno v:
Annali di Matematica Pura ed Applicata (1923 -). 201:2261-2285
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a03a28a04ec8b467b9a12e04f3692c6e
https://doi.org/10.1007/s10231-022-01199-6
https://doi.org/10.1007/s10231-022-01199-6
Publikováno v:
Results in Mathematics. 78
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2113d2231b7070a90b0aa0c37352bd9
https://doi.org/10.1007/s00025-022-01808-z
https://doi.org/10.1007/s00025-022-01808-z
Autor:
Josué Meléndez, Oscar Palmas
Publikováno v:
Boletín de la Sociedad Matemática Mexicana. 28
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::df5259c85ec5375c514aa58f9574af66
https://doi.org/10.1007/s40590-022-00439-2
https://doi.org/10.1007/s40590-022-00439-2
Autor:
Oscar Palmas
Publikováno v:
Miscelánea Matemática de la Sociedad Matemática Mexicana. 70:59-75
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd80feddcb7196007dd4b9b4c10d573a
https://doi.org/10.47234/mm.7004
https://doi.org/10.47234/mm.7004
Publikováno v:
Mathematische Nachrichten. 293:1534-1553
We introduce a class of null hypersurfaces of a semi-Riemannian manifold, namely, screen quasi-conformal hypersurfaces, whose geometry may be studied through the geometry of its screen distribution. In particular, this notion allows us to extend some
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4dbde180b611533bbf813a8033e85b58
https://doi.org/10.1002/mana.201800494
https://doi.org/10.1002/mana.201800494
Publikováno v:
Developments in Lorentzian Geometry ISBN: 9783031053788
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce26e1a3ceb587fad250269a74a47cc8
https://doi.org/10.1007/978-3-031-05379-5_15
https://doi.org/10.1007/978-3-031-05379-5_15
Publikováno v:
Differential Geometry and its Applications. 84:101923
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b228123f1b46b1b606c076afb95a3546
https://doi.org/10.1016/j.difgeo.2022.101923
https://doi.org/10.1016/j.difgeo.2022.101923
Autor:
Oscar Palmas
Publikováno v:
Mediterranean Journal of Mathematics. 18
We define and study the hypersurfaces in the title, showing that under suitable conditions they have at most two different non-zero screen principal curvatures. In the case of having exactly two different non-zero screen principal curvatures at each
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca2b423f3a710f20e8330a1993c16f5c
https://doi.org/10.1007/s00009-021-01777-7
https://doi.org/10.1007/s00009-021-01777-7
Publikováno v:
Differential Geometry and its Applications. 58:65-82
In this paper we study the rigidity of complete hypersurfaces with constant scalar curvature in Riemannian space forms. Under an appropriate constraint on Φ, the traceless part of its second fundamental form, we prove that either the hypersurface is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d49829c6c431dd14815137b365d8b84d
https://doi.org/10.1016/j.difgeo.2018.01.001
https://doi.org/10.1016/j.difgeo.2018.01.001