منابع مشابه
How Bats Land Upside Down
A new study reveals that bats use the inertia of their unusually heavy wings-rather than their aerodynamic properties-to help them perform acrobatic maneuvers like landing upside down to roost. Read the Research Article.
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Specific preference statements may reverse general preference statements, thus constituting a change of attitude in particular situations. We define a semantics of preference reversal by relaxing the popular ceteris-paribus principle. We characterize preference reversal as default reasoning and we link it to prioritized Pareto-optimization, which permits a natural computation of preferred solut...
متن کاملRamanujan Series Upside-down
We prove that there is a correspondence between Ramanujan-type formulas for 1/π and formulas for Dirichlet L-values. Our method also allows us to reduce certain values of the Epstein zeta function to rapidly converging hypergeometric functions. The Epstein zeta functions were previously studied by Glasser and Zucker.
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Over the recent years, several proposals were made to enhance database systems with automated reasoning. In this article we analyze two such enhancements based on meta-interpretation. We consider on the one hand the theorem prover Satchmo, on the other hand the Alexander and Magic Set methods. Although they achieve different goals and are based on distinct reasoning paradigms, Satchmo and the A...
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Within African savannas, elephants often damage individual trees to the extent that they influence tree density. New research shows that mutualistic ants inhabiting certain species of Acacia protect trees from catastrophic herbivory by elephants. Protection by the ants stabilizes tree cover across savannas in what is otherwise a highly dynamic biome.
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ژورنال
عنوان ژورنال: PLOS Biology
سال: 2015
ISSN: 1545-7885
DOI: 10.1371/journal.pbio.1002298