Seven point two

[One point one-seven-two. We've got the impact factor].

Hace ya tres años anunciábamos con cierto júbilo que Gaceta Sanitaria habı́a sido admitida en el selecto club del ISI-Web of Knowledge. Eso significaba que la revista iba a aparecer en las bases de datos bibliométricas que permiten el cálculo del factor de impacto bibliográfico. Desde entonces nos han preguntado varias veces, más bien insistentemente y no es ninguna exageración: ¿cuándo podremos...

Seven-Point Difference Schemes for Hyperbolic Equations

A necessary and sufficient condition is given for all hyperbolic difference schemes that use up to nine mesh points to be of second-order accuracy. We also construct a new difference scheme for two-dimensional hyperbolic systems of conservation laws. The scheme is of second-order accuracy and requires knowledge of only seven mesh points. A stability condition is obtained and is utilized in nume...

An analytic result for the two - loop seven - point MHV amplitude in N = 4 SYM

We describe a general algorithm which builds on several pieces of data available in the literature to construct explicit analytic formulas for two-loop MHV amplitudes in N = 4 super-Yang-Mills theory. The non-classical part of an amplitude is built from A3 cluster polylogarithm functions; classical polylogarithms with (negative) cluster X coordinate arguments are added to complete the symbol of...

Seven±two software measurement conundrums

Since computer science has traditionally considered itself more an application of discrete logic than of continuous functions, measurement has not played as important a role in software as it has in other areas of engineering. Since few computer science programs teach courses in measurement theory, statistics, experimental design, or related areas, software engineering has not benefited from ri...

Two Results about Fixed Point of Multifunctions