Revistas académicas de la Universidad Católica del Norte
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About the solutions of linear control systems on Lie groups
No full textIn this paper we prove in details the completeness of the solutions of a linear control system on a connected Lie group. On the other hand, we summarize some results showing how to compute the solutions. Some examples are given
¿Qué tanto afecta la fama y el éxito sobre la esperanza de vida? Caso de estudio: Ganadores y nominados a los premios Oscar
Get PDFLife expectancy (LE) is an indicator of the quality of life that a group has, as it relates to its economic and social development.However, effects of fame and success on LE are difficult to assess. Objective: To analyze a group of celebrities, winners and nominees to the Cinema Academy Award. Method: The study included a population of 1310, from which 533 dead people in the categories of main and supporting actors and directors were selected. These 533 were contrasted with national population statistics of the United States from 1860 to 2016. Results: Both populations register similar causes of death; however, celebrities decrease their LE due to the excess of drug abuse and accidents in their life styles. Conclusion: Fame and the stress of keeping a high social status may decrease LE of those who adopt life styles with higher risks and social pressure.La esperanza de vida (EV) es un indicador de la calidad de vida que un grupo tiene, al relacionarse con su desarrollo económico y social. Sin embargo, los efectos del éxito y la fama sobre la EV no son fáciles de evaluar. En esta investigación se analizó un grupo de personas famosas y exitosas: los ganadores y nominados al premio de la Academia de las Artes y las Ciencias Cinematográficas de Estados Unidos (Oscar). El estudio involucró a 1310 individuos, de los cuales se seleccionaron 533 personas fallecidas en las categorías de actrices y actores principales, de reparto y directores, mismos que se contrastaron contra las estadísticas nacionales de la población de Estados Unidos, durante el periodo de 1860 hasta 2016. Los resultados indicaron que ambas poblaciones poseen causas de muerte similares; sin embargo, los miembros del Oscar tienden a decrementar su EV por causas que pueden relacionarse con su estilo de vida, tales como el consumo de drogas y accidentes. Se concluye que la fama y el estrés por mantener un determinado estatus, pueden decrementar la EV de una población, al adoptar estilos de vida con mayores presiones y riesgos
On some properties of a class of polynomials suggested by mittal
No full textThe object of this paper is to establish some generating relations by using operational formulae for a class of polynomials defined by Mittal. We have also derived finite summation formulae for (1.6) by employing operational techniques. In the end several special cases are discussed
A note on the fundamental group of a one-point extension
No full textIn this note, we consider an algebra A which is a one-point extension of another algebra B and we study the morphism of fundamental groups induced by the inclusion of (the bound quiver of ) B into (that of ) A. Our main result says that the cokernel of this morphism is a free group and we prove some consequences from this fact
On characterization of riemannian manifolds
No full textThis survey, present some results about characterization of Riemannian manifolds by using notions of convexity. The first part deals with immersed manifolds and the second part gives a characterization for the Euclidean space and for the Euclidean sphere
Sharp inequalities for factorial n
No full textLet n be a positive integer. We provewith the best possible constantsThis refines and extends a result of Sandor and Debnath, who proved that the double inequality holds with a = 0 and ß = 1
A new notion of SP-compact L-fuzzy sets
No full textA new notion of SP-compactness is introduced in L-topological spaces by means of semi-preopen L-sets and their inequality, where L is a complete De Morgan algebra. This new notion does not depend on the structure of basis lattice L and L does not require any distributivity. This new notion implies semicompactness, hence it also implies compactness. This new notion is a good extension and it has many characterizations if L is completely distributive De Morgan algebra
Diffeological spaces
No full textWe define diffeological spaces and give some examples. The diffeological category contains the category of smooth manifolds as full subcategory. We prove that diffeological spaces and smooth maps form a cartesian closed category. The concepts of differential form and tangent functor are extended from smooth manifolds to diffeological spaces
Representation theorems of linear operators on p-adic function spaces
No full textLet X be a 0-dimensional Hausforff topological space, E, F nonarchimedean Banach spaces and Cb(X, E) the space of all continuous E-valued functions on X provided with two strict topologies. In this paper we show that every F-valued linear operator which is strictly continuous can be represented by a certain L(E, F )-valued measure defined on the ring of all clopen subsets of X
