Order theoryOrder theory is a branch of mathematics that investigates the intuitive notion of order using binary relations. It provides a formal framework for describing statements such as "this is less than that" or "this precedes that". This article introduces the field and provides basic definitions. A list of order-theoretic terms can be found in the order theory glossary. Orders are everywhere in mathematics and related fields like computer science. The first order often discussed in primary school is the standard order on the natural numbers e.
Designvignette|Chaise de Charles Rennie Mackintosh, 1897. Le design, le stylisme ou la stylique est une activité de création souvent à vocation industrielle ou commerciale, pouvant s’orienter vers les milieux sociaux, politiques, scientifiques et environnementaux. Le but premier du design est d’inventer, d’améliorer ou de faciliter l’usage ou le processus d’un élément ayant à interagir avec un produit ou un service matériel ou virtuel.
Energy-efficient landscapingEnergy-efficient landscaping is a type of landscaping designed for the purpose of conserving energy. There is a distinction between the embedded energy of materials and constructing the landscape, and the energy consumed by the maintenance and operations of a landscape. Landscaping often refers to the practice of landscape design and gardening, which traditionally concern with designing sites with vegetation and craft for aesthetic, cultural, social, and religious purposes.
OpenOffice.orgOpenOffice.org (surnommé « projet OOo ») est un projet né le à l'initiative de Sun Microsystems en vue de produire une suite bureautique libre et gratuite fondée sur StarOffice. Le produit résultant est diffusé sous le même nom et sous plusieurs licences (la LGPL et, jusqu’à la version 2.0 beta 2 incluse, la SISSL), et fonctionne sur plusieurs plateformes dont Windows, de nombreux Unix (Linux, Solaris), ou Apple Mac OS X. La première version d'OpenOffice est lancée le 1er mai 2002.
Non-measurable setIn mathematics, a non-measurable set is a set which cannot be assigned a meaningful "volume". The mathematical existence of such sets is construed to provide information about the notions of length, area and volume in formal set theory. In Zermelo–Fraenkel set theory, the axiom of choice entails that non-measurable subsets of exist. The notion of a non-measurable set has been a source of great controversy since its introduction. Historically, this led Borel and Kolmogorov to formulate probability theory on sets which are constrained to be measurable.
