منابع مشابه
On an Algorithm for a Double-resolvability Test
To find all doubly resolvable designs with definite parameters, we construct the design resolutions in lexicographic order point by point. To partial solutions with more than 2/3 of the points we apply a double-resolvability test, namely we try to construct an orthogonal resolution. The test reduces significantly the number of partial solutions, and is very important for the efficiency of the w...
متن کاملResolvability and Monotone Normality
A space X is said to be κ-resolvable (resp. almost κ-resolvable) if it contains κ dense sets that are pairwise disjoint (resp. almost disjoint over the ideal of nowhere dense subsets). X is maximally resolvable iff it is ∆(X)-resolvable, where ∆(X) = min{|G| : G 6= ∅ open}. We show that every crowded monotonically normal (in short: MN) space is ω-resolvable and almost μ-resolvable, where μ = mi...
متن کاملResolvability of Infinite Designs
In this paper we examine the resolvability of infinite designs. We show that in stark contrast to the finite case, resolvability for infinite designs is fairly commonplace. We prove that every t-(v, k,Λ) design with t finite, v infinite and k, λ < v is resolvable and, in fact, has α orthogonal resolutions for each α < v. We also show that, while a t-(v, k,Λ) design with t and λ finite, v infini...
متن کاملThree Cases of a Rare Association: Double Aortic Arch
Background Vascular ring is less than 1% of congenital heart disease. Double aortic arch (DAA) is the most common form of it. Its detecting is important because of the effects of pressure on the esophagus and trachea. Case Report In this study, three children suffering from double aortic arch with symptoms of dysphagia and recurrent aspiration, which in two cases had led to cardiac arrest, wer...
متن کاملResolvability of references in users' personal collections
Introduction. Digital library users collect, enhance and manage their online reference collections to facilitate their research tasks. These personal collections, therefore, are likely to reflect users' interests, and are representative of their profile. Understanding these collections offers great opportunities for developing personalized digital library services, such as reference recommender...
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ژورنال
عنوان ژورنال: Journal of Combinatorial Theory, Series A
سال: 1979
ISSN: 0097-3165
DOI: 10.1016/0097-3165(79)90106-7