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A propos des objets caractérisés par une propriété universelle

Le but de ce texte est de d etailler la mani ere d'utiliser les objets caract eris es par ce que l'on appelle une propri et e universelle ; vous en avez rencontr e sans doute essentiellement en alg ebre (quotients divers, alg ebres de polynômes...) et en topologie (compl et e d'un espace m etrique, espace topologique quotient...). Pour bien les comprendre, et eviter de se laisser noyer dans la ...

Quelque contribution à l'optimisation de constellations de satellites

Why Amazon Chose TLA +

Since 2011, engineers at Amazon have been using TLA+ to help solve difficult design problems in critical systems. This paper describes the reasons why we chose TLA+ instead of other methods, and areas in which we would welcome further progress.

Why Nature Chose Selenium.

The authors were asked by the Editors of ACS Chemical Biology to write an article titled "Why Nature Chose Selenium" for the occasion of the upcoming bicentennial of the discovery of selenium by the Swedish chemist Jöns Jacob Berzelius in 1817 and styled after the famous work of Frank Westheimer on the biological chemistry of phosphate [Westheimer, F. H. (1987) Why Nature Chose Phosphates, Scie...

...Plus la Même Chose

In the last editorial (‘plus ça change’—[1]), we briefly looked at some of the major changes in scholarly communication, and how some things hadn’t changed at all. This lack of change has frustrated all of those progressives who feel we’ve not even begun to take advantage of all the opportunities offered. It’s easy to sympathise, when you think of all the things we can now do with electronic sy...