Recent work by a number of people has shown that complex reflection groups give rise to many representation-theoretic structures (e.g., generic degrees and families of characters), as though they were Weyl groups of algebraic groups. Conjecturally, these structures are actually describing the representation theory of as-yet undescribed objects called spetses, of which reductive algebraic groups...

Given a representation N of reductive group G, Braverman–Finkelberg–Nakajima have defined remarkable Poisson variety called the Coulomb branch. Their construction this space was motivated by considerations from 3d gauge theories and symplectic duality. The coordinate ring branch is as convolution algebra, using vector bundle over affine Grassmannian G. This maps to loops in N. We study fibres m...

ATLAS OF ANTARCTICA: TOPOGRAPHIC MAPS FROM GEOSTATISTICAL ANALYSIS OF SATELLITE RADAR ALTIMETER DATA / Ute Christina Herzfeld. Berlin: Springer Verlag, 2004. xvi, 364 pp.: 169 illus., CD-ROM; 10.8 7.800. ISBN 3-540-43457-7 (cloth), US$159.00. Available from: Springer, 233 Spring Street, New York, NY 10013 USA. Toll-free tel. 1-800-SPRINGER. E-mail [email protected]. Web http://www.spr...

We propose to regard a diagnostic system as an ordered logic theory, i.e. a partially ordered set of clauses where smaller rules carry more preference. This view leads to a hierarchy of the form observations < system description < fault model, between the various knowledge sources. It turns out that the semantics for ordered logic programming nicely fits this intuition: if the observations cont...

1. Retraction of articles from Springer journals. London: Springer, August 18, 2015 (http://www.springer.com/gp/about-springer/ media/statements/retraction-of-articles -from-springer-journals/735218). 2. McCook A. 64 More papers retracted for fake reviews, this time from Springer journals. Retraction Watch (http://retractionwatch .com/2015/08/17/64-more-papers-retracted -for-fake-reviews-this-t...

Optimization has been expanding in all directions at an astonishing rate during the last few decades. New algorithmic and theoretical techniques have been developed, the diffusion into other disciplines has proceeded at a rapid pace, and our knowledge of all aspects of the field has grown even more profound. At the same time, one of the most striking trends in optimization is the constantly inc...

This article studies components of Springer fibers for gl(n) that are associated to closed orbits of GL(p) × GL(q) on the flag variety of GL(n), n = p+ q. These components occur in any Springer fiber. In contrast to the case of arbitrary components, these components are smooth varieties. Using results of Barchini and Zierau we show these components are iterated bundles and are stable under the ...