Black Republican cherry Black Republican cherry The Black Republican cherry is a cultivar of cherry. While it is a hybrid, its parentage is not known; it is possibly a cross of the Napoleon and Black Tartarian cultivars, but has also been described as a seedling of the Eagle variety. It is one of the parents of the Bing cherry. The Black Republican was first grown in Oregon about 1860 by the horticulturist Seth Lewelling, who gave it its name as a reflection of his Abolitionist beliefs. The fruit of the Black Republican is small, firm, and deep purple in color, with an intense
History of manifolds and varieties History of manifolds and varieties The study of manifolds combines many important areas of mathematics: it generalizes concepts such as curves and surfaces as well as ideas from linear algebra and topology. Certain special classes of manifolds also have additional algebraic structure; they may behave like groups, for instance. In that case, they are called Lie Groups. Alternatively, they may be described by polynomial equations, in which case they are called algebraic varieties, and if they additionally carry a group structure, they are called algebraic groups. The term "manifold" comes from German "Mannigfaltigkeit," by Riemann. In English, "manifold" refers to