The acronyms of ENL, ESL, and EFL have been around for long enough as names of certain varieties of English depending on their locale and related circumstances of use. In their expanded form, they are known as ' ', ' ', and ' '. Far from being hypothetical varieties of the language, the three have their distinctive traits that are measurable along sociolinguistic and linguistic clines. On both ...

Extremal Optimization (EO), a new local search heuristic, is used to approximate ground states of the mean-field spin glass model introduced by Sherrington and Kirkpatrick. The implementation extends the applicability of EO to systems with highly connected variables. Approximate ground states of sufficient accuracy and with statistical significance are obtained for systems with more than N = 10...

We describe a theory to account for the acquisition and extinction of response rate (conditioning) and pattern (timing). This modular theory is a development of packet theory (Kirkpatrick, 2002; Kirkpatrick & Church, 2003) that adds a distinction between pattern and strength memories, as well as contributing closed-form equations. We describe the theory using equations related to a flow diagram...

We develop the cavity method for the spherical Sherrington-Kirkpatrick model at high temperature and small external field. As one application, we carry out the second moment computations for the overlap and the magnetization.

The width of a set of n points in the plane is the smallest distance between two parallel lines that enclose the set. We maintain the set of points under insertions and deletions of points and we are able to report an approximation of the width of this dynamic point set. Our data structure takes linear space and allows for reporting the approximation with relative accuracy in O( p 1= logn) time...