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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No FI Grupo ÁREA 1: INGENIERIA BIOMÉDICA Aplicaciones tecnológicas avanzadas y salud humana 13,461 Desco M 5 Arquitectura de computadores, comunicaciones y sistemas. ARCOS 1,575 Carretero Perez J 1 Técnicas estadísticas no paramétricas y de computación intensiva 0,417 Romo Urroz J 1 ÁREA 2: ENFERMEDADES CARDIOVASCULARES Historia natural de la enfermedad cardiaca 38,431 Fernández-Avilés F 7 Fisi...
متن کاملTransversal Lattices
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 ...
متن کاملTransversal Theory
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...
متن کاملHyperfinite Transversal Theory. Ii
We continue the investigation of validity of Hall’s theorem in the case of the Loeb space L(H) of an internal, uniformly distributed, hyperfinite measure space H = (Ω,A, μ) initiated in1992 by the author. Some new classes of graphs are introduced for which the measure theoretic version of Hall’s theorem still holds.
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ژورنال
عنوان ژورنال: FLORESTA
سال: 2006
ISSN: 1982-4688,0015-3826
DOI: 10.5380/rf.v3i2.5709