منابع مشابه
Opaque Predicates, Veiled Sets and Their Logic
Motivated by considerations in the foundations of quantum mechanics and inspired by the literature on vague predicates, we introduce the concept of an opaque predicate. While in the case of vague predicates there is a kind of indeterminacy with respect to the predicate, in the sense that the vagueness concerns whether a well-determined object satisfies it or not, in the case of opaque predicate...
متن کاملA Lower Bound on Opaque Sets
We prove a lower bound of 2.00002 on the the total length of a set (of curves) that intersects every line that intersects the unit square. The best known lower bound has been 2, established by Jones in 1964.
متن کاملOpaque hemithorax
Complete opacification of a hemithorax on chest X-ray is termed opaque hemithorax (OH) and is a common finding in emergency room patients. Attending physicians encountering an OH should be able to make an immediate decision regarding the most appropriate approach. The differential diagnosis of an OH is primarily based on the volume of the affected hemithorax, as determined by the position of th...
متن کاملSilhouette-Opaque Transparency Rendering
Transparency in 3D graphics has traditionally been created by ordering the transparent objects from back-to-front with respect to the viewpoint, and rendering the opaque objects first and then the transparent objects in the prescribed order. This has three major disadvantages: need for splitting intersecting polygons, repeated ordering for varying view points, and finally, incorrect transparenc...
متن کاملOpaque perfect lenses
The response of the “perfect lens”, consisting of a slab of lossless material of thickness d with εs = μs = −1 at one frequency ω0 is investigated. It is shown that as time progresses the lens becomes increasingly opaque to any physical TM line dipole source located a distance d0 < d/2 from the lens and which has been turned on at time t = 0. Here a physical source is defined as one which suppl...
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ژورنال
عنوان ژورنال: Algorithmica
سال: 2012
ISSN: 0178-4617,1432-0541
DOI: 10.1007/s00453-012-9735-2