Bing cherry He worked as a foreman in the Lewelling family fruit orchards in Milwaukie for about 35 years, supervising other workers and caring for trees. He went back to China in 1889 for a visit. Due to the restrictions of the Chinese Exclusion Act of 1882 he never returned to the United States. Sources disagree as to whether Ah Bing was responsible for developing the cultivar, or whether it was developed by Lewelling and named in Bing's honor due to his long service as orchard foreman. Bing cherries are used almost exclusively for fresh market. Bings are large, dark and firm
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