Solitary Islands Marine Park sweetlip ("Plectorhinchus gibbosus") occur with mulloway ("Argyrosomus japonicus"), snapper, red morwong ("Cheilodactylus fuscus"), silver trevally ("Pseudocaranx georgianus"), bream ("Acanthopagrus" spp.) and tarwhine ("Rhabdosargus sarba"). Marine turtles are common in the Park, with green turtle ("Chelonia mydas"), loggerhead turtle ("Caretta caretta"), hawksbill turtle ("Eretmochelys imbricata") and occasional sightings of leatherback turtles. Nesting green turtles and loggerhead turtles have been recorded on several beaches, with some eggs hatching successfully. Only a few species of sea snakes have been recorded in the region, including the Elegant sea snake ("Hydrophis elegans") and Yellow-bellied sea snake ("Pelamis platurus"). The only reptile recorded on Muttonbird Island
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