منابع مشابه
Approximating the Obstacle Number for a Graph Drawing Efficiently
An obstacle representation for a (straight-line) graph drawing consists of the positions of the graph vertices together with a set of polygonal obstacles such that every line segment between a pair of non-adjacent vertices intersects some obstacle, while the vertices and edges of the drawing avoid all the obstacles. The obstacle number obs(D) for a graph drawing D is the least number of obstacl...
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Decentralization can improve service delivery, but it can also generate externalities across jurisdictional boundaries. We examine the nature and size of water pollution externalities as rivers flow across jurisdictions. Panel data on water pollution in Brazilian rivers coupled with county splits that change the locations of borders allow us to identify the spatial patterns of pollution as rive...
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Article history: Received 6 January 2012 Revised 20 August 2012 Available online 17 October 2012 JEL classification: F16 F22 F66 J61 O15
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Reality does not recognize borders. Why we should use the very general term of “reality” and not science, because the borders that we draw are pure delusions, and on the opposite side there is the reality. The laws of the universe, either the physical nature of the world which the scientist studies or metaphysics which is the territory of philosophers, it isthe same reality that rules. Today ma...
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Editorial It is my honor to introduce the first issue of the Journal of Periodontal & Implant Science (JPIS) under the auspices of the Korean Academy of Periodontology (KAP) which has reached its 50th year of foundation. The KAP was established in 1960 and issued its first official publication, the Journal of the Korean Academy of Periodontology (JKAP) in 1971. Since then, it has been providing...
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ژورنال
عنوان ژورنال: Theory of Computing Systems
سال: 2008
ISSN: 1432-4350,1433-0490
DOI: 10.1007/s00224-008-9117-y