Touraine AOC and from Sauvignon blanc and Arbois grapes. The white Touraine wines are dry, fairly firm, lively and full, and keep well when bottled. The sparkling wines are allowed to use the designation "Touraine mousse" (sparkling Touraine wine). Up to 20% of Chardonnay grapes may be included in the mixture of varieties grown. The red wines are produced from Cabernet Franc, Cabernet Sauvignon, Côt, Pinot noir, Pinot Meunier, Pinot gris, Pineau d'Aunis and Gamay grape varieties (Gamay is used only for wines marketed in the first year after production). These wines are flavoursome and tannic in character. Touraine wines sold in
History of manifolds and varieties spaces with a differentiable or topological structure, while "variety" refers to spaces with an algebraic structure, as in algebraic varieties. In Romance languages, manifold is translated as "variety" – such spaces with a differentiable structure are literally translated as "analytic varieties", while spaces with an algebraic structure are called "algebraic varieties". Thus for example, the french word "" means topological manifold. In the same vein, the Japanese word "" (tayōtai) also encompasses both manifold and variety. ("" (tayō) means various.) Ancestral to the modern concept of a manifold were several important results of 18th and 19th century mathematics. The oldest