Ultra wide angle lens the difference is only whether distortion is present or not. However, the shorter the focal length, the more difficult it is to implement rectilinear correction. In fisheye lenses, the visual angle is close to or more than 180 degrees in at least one direction. For example, a "diagonal fish eye" would have a viewing angle of at least 180 degrees within the diagonals of the frame. A "circular fisheye" would represent the image in the form of a circle. Rectilinear ultra-wide angle lenses are used in photography and cinematography sometimes to achieve three-dimensional perspective distortion instead of simply two-dimensional barrel
Center for Women in Mathematics Center for Women in Mathematics The Center for Women in Mathematics, a part of the Smith College Department of Mathematics and Statistics, is an American educational program founded in 2007 to increase the involvement of women in mathematics. The Center aims for students to engage in coursework and research in a mathematical environment that actively supports women. The Junior Program is designed for undergraduate women who wish to spend a year or a semester studying mathematics at a women's college. Financial aid funding is provided by the National Science Foundation. The Post-Baccalaureate Program is geared towards women with bachelor's degrees