Jensen Beach, Florida off in order to protect the nests of the sea turtles. The three species found on this beach are the loggerhead, leatherback turtle and green sea turtle. Loggerhead nests are the most common type found on this and adjacent beaches. Locations of the sea turtles' nests are marked with the approximate date in which the eggs were laid and the expected date in which the eggs will hatch. These notifications are meant to discourage tourists and residents from visiting the beach in the evening hours during these time periods. Efforts are made to protect both species of sea turtles since
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