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In order theory, a branch of mathematics, a linear extension of a partial order is a total order (or linear order) that is compatible with the partial order. As a classic example, the lexicographic order of totally ordered sets is a linear extension of their product order. A partial order is a reflexive, transitive and antisymmetric relation.
Lyon–Saint Exupéry Airport (Aéroport de Lyon-Saint Exupéry), formerly known as Lyon Satolas Airport , is the international airport of Lyon, the third-biggest city in France and an important transport facility for the entire Auvergne-Rhône-Alpes region. It lies in Colombier-Saugnieu, southeast of Lyon's city centre. The airport is 30 minutes from the Lyon-Part-Dieu business district by the Rhônexpress tram. The airport was inaugurated by President Valéry Giscard d'Estaing on 12 April 1975, and opened to passengers a week later.
Life extension is the concept of extending the human lifespan, either modestly through improvements in medicine or dramatically by increasing the maximum lifespan beyond its generally-settled limit of 125 years. Several researchers in the area, along with "life extensionists", "immortalists" or "longevists" (those who wish to achieve longer lives themselves), postulate that future breakthroughs in tissue rejuvenation, stem cells, regenerative medicine, molecular repair, gene therapy, pharmaceuticals, and organ replacement (such as with artificial organs or xenotransplantations) will eventually enable humans to have indefinite lifespans (agerasia) through complete rejuvenation to a healthy youthful condition.