• keeps track of a “boundary ” in X, or • contains infinitesimal information about a family, of which X is a fiber and involves monoids ( → toric geometry, combina-torics, etc.). Example: start with a smooth non-proper variety Y/k, compactify it to Y ⊆ X, and say D = X \ Y is a NC (normal crossings) divisor. X is nicer to work with, but what we actually care about is Y. Idea: encode the stuff that we added (the divisor D) in the geometry. One way to do it: take M(U) = {f ∈ OX(U) | f is invertible outside of D}. This is a subsheaf of monoids of OX containing O×X, that somehow keeps track of the boundary D.

process naming to allow libraries to describe their communication in terms suitable to their own data structures and algorithms, ffl The ability to "adorn" a set of communicating processes with additional user-defined attributes, such as extra collective operations. This mechanism should

. This problem is readily solved in some parametric circumstances. For example, if the joint distribution were normal then we would combine data from X and Z to estimate the mean and variance of X; proceed analogously to estimate the mean and variance of Y; but use data from Z alone to estimate E(XY). However

Abstract—We document the performance of space–time block codes [13], [14], which provide a new paradigm for transmission over Rayleigh fading channels using multiple transmit antennas. Data is encoded using a space–time block code, and the encoded data is split into n streams which

Human resources management systems are having a wide audience at present. However, no truly integrate solution has been proposed yet to improve the systems concerned. Exist-ing approaches classification attempt is made in this paper. Possible approaches to extra data collection for decision

. This extra information plays the same role as consumer-level data, allowing estimated substitution patterns and (thus) welfare to directly reflect demographic-driven differences in tastes for observed characteristics. I apply the technique to the automobile market, estimating the economic effects

, but extra "compensating" queries are used to eliminate anomalies. We also introduce two streamlined versions of ECA for special cases of views and updates, and we present an initial performance study that compares ECA to a view recomputation algorithm in terms of messages transmitted, data

accurate than explicit measures [Nic97], but as large quantities of implicit data can be gathered at no extra cost to the user, they are attractive alternatives. Moreover, implicit measures can be combined with explicit ratings to obtain a more accurate representation of user interests. Implicit

spatstat is a package for analyzing spatial point pattern data. Its functionality includes exploratory data analysis, model-fitting, and simulation. It is designed to handle realistic datasets, including inhomogeneous point patterns, spatial sampling regions of arbitrary shape, extra covariate data

We address the problem of designing data structures that allow efficient search for approximate nearest neighbors. More specifically, given a database consisting of a set of vectors in some high dimensional Euclidean space, we want to construct a space-efficient data structure that would allow us