منابع مشابه
Characterizations of Transversal and Fundamental Transversal Matroids
A result of Mason, as refined by Ingleton, characterizes transversal matroids as the matroids that satisfy a set of inequalities that relate the ranks of intersections and unions of nonempty sets of cyclic flats. We prove counterparts, for fundamental transversal matroids, of this and other characterizations of transversal matroids. In particular, we show that fundamental transversal matroids a...
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A flat of a matroid is cyclic if it is a union of circuits; such flats form a lattice under inclusion and, up to isomorphism, all lattices can be obtained this way. A lattice is a Tr-lattice if all matroids whose lattices of cyclic flats are isomorphic to it are transversal. We investigate some sufficient conditions for a lattice to be a Tr-lattice; a corollary is that distributive lattices of ...
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Full integration of energy conversion devices for compact power supply circuits is still encountering strong technological locks, especially to integrate passive inductive and capacitive components. The increasing working frequency of those devices, which already reaches 1 Megahertz, would enable the size reduction of passive components and then their integration. Nevertheless, losses, which hi...
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1. Introduction. Transversal theory is a branch of combinatorial mathematics which is only just beginning to emerge as a reasonably connected and coherent subject. Whether this is yet rich enough or mature enough to be called a 'theory' may be a matter for debate; indeed, it is by no means certain that this part of mathematics may not finally be classified under some broader, more comprehensive...
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Il s’agit d’un enfant de 4 ans, sans ATCD pathologique particulier, qui présente depuis 2 mois une tuméfaction inflammatoire, douloureuse, rapidement progressive de l’œil gauche. A l’examen, l’AV était à 2/10 et on retrouve une exophtalmie, axile, inflammatoire, irréductible et non pulsatile de cet œil. Une TDM orbito-cérebrale réalisée chez ce patient montre un processus orbitaire intra et ext...
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ژورنال
عنوان ژورنال: Revista Pleiade
سال: 2020
ISSN: 2674-8231,1980-8666
DOI: 10.32915/pleiade.v13i29.638