97,276 research outputs found
Homology and K-theory of the Bianchi groups
We reveal a correspondence between the homological torsion of the Bianchi
groups and new geometric invariants, which are effectively computable thanks to
their action on hyperbolic space. We use it to explicitly compute their
integral group homology and equivariant -homology. By the Baum/Connes
conjecture, which holds for the Bianchi groups, we obtain the -theory of
their reduced -algebras in terms of isomorphic images of the computed
-homology. We further find an application to Chen/Ruan orbifold cohomology.
% {\it To cite this article: Alexander D. Rahm, C. R. Acad. Sci. Paris, Ser. I
+++ (2011).
A Review of the Genus \u3ci\u3eGryllus\u3c/i\u3e (Orthoptera: Gryllidae), With a New Species From Korea
Gryllus is the most widely distributed genus of the Tribe Gryllini, and may be the largest; it includes 69 described species occupying most of the New World, Africa, and Europe, and much of Asia. A new species from Korea significantly extends the known range of the genus
Progress on Intelligent Guidance and Control for Wind Shear Encounter
Low altitude wind shear poses a serious threat to air safety. Avoiding severe wind shear challenges the ability of flight crews, as it involves assessing risk from uncertain evidence. A computerized intelligent cockpit aid can increase flight crew awareness of wind shear, improving avoidance decisions. The primary functions of a cockpit advisory expert system for wind shear avoidance are discussed. Also introduced are computational techniques being implemented to enable these primary functions
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