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Mostrando ítems 181-190 de 198
Artículo
Algunos resultados sobre el bordismo de variedades de homología
(Real Academia de Ciencias Exactas, Físicas y Naturales, 1987)
En este artículo probamos que las variedades de homología (HML-variedades) definen una teoría de bordismo singular que es la teoría de homología generalizada asociada al Espectro de Martin. Usando ios números característicos ...
Artículo
The contact magnetic flow in 3D Sasakian manifolds
(IOP Publishing, 2009-05-15)
We first present a geometrical approach to magnetic fields in three-dimensional Riemannian manifolds, because this particular dimension allows one to easily tie vector fields and 2-forms. When the vector field is divergence ...
Artículo
Almost cosymplectic and almost Kenmotsu (κ, μ, ν)-spaces
(Springer, 2013-08)
We study the Riemann curvature tensor of (κ, µ, ν)-spaces when they have almost cosymplectic and almost Kenmotsu structures, giving its writing explicitly. This leads to the definition and study of a natural generalisation of ...
Artículo
The contact number of a pseudo-Euclidean submanifold
(Mathematical Society of the Republic of China, 2008-10)
In this paper we define the contact number of a pseudo-Riemannian submanifold into the pseudo-Euclidean space, and prove that this contact number is closely related to the notion of pseudo-isotropic submanifold. We give ...
Artículo
Computation of isotopisms of algebras over finite fields by means of graph invariants
(Elsevier, 2017-07)
In this paper we define a pair of faithful functors that map isomorphic and isotopic finite-dimensional algebras over finite fields to isomorphic graphs. These functors reduce the cost of computation that is usually ...
Artículo
Isomorphism and Isotopism Classes of Filiform Lie Algebras of Dimension up to Seven Over Finite Fields
(Springer, 2016)
Since the introduction of the concept of isotopism of algebras by Albert in 1942, a prolific literature on the subject has been developed for distinct types of algebras. Nevertheless, there barely exists any result on the ...
Artículo
Extension of Santilli's isotopies to non-injective isoalgebras
(Kyungnam University Press, 2005)
Santilli's isotopies constitute a new branch of mathematics characterized by axiom-preserving isotopic lifting of units, products, numbers, fields, topologies, geometries, algebras, groups, etc., with numerous novel ...
Artículo
¿Perderse en un laberinto? No con las matemáticas
(Federación Iberoamericana de Sociedades de Educación Matemática, 2010-03)
En este artículo se sugiere la posibilidad de introducir algunos temas de las Matemáticas de Secundaria o Bachillerato, como la Combinatoria o la Probabilidad, mediante la utilización de los laberintos. Para ello se define ...
Artículo
Graphs associated with nilpotent Lie algebras of maximal rank
(European Mathematical Society, 2003)
In this paper, we use the graphs as a tool to study nilpotent Lie algebras. It implies to set up a link between graph theory and Lie theory. To do this, it is already known that every nilpotent Lie algebra of maximal rank ...
Artículo
Null pseudo-isotropic Lagrangian surfaces
(Polish Academy of Sciences, Institute of Mathematics, 2017)
In this paper we will show that a Lagrangian, Lorentzian surface M 2 1 in a complex pseudo space form Mf2 1 (4c) is pseudo-isotropic if and only if M is minimal. Next we will obtain a complete classification of all ...