Persian cat since the early 1990s and the Persian lost its top spot to the British Shorthair in 2001. As of 2012, it was the 6th most popular breed, behind the British Shorthair, Ragdoll, Siamese, Maine Coon and Burmese. In France, the Persian is the only breed whose registration declined between 2003 and 2007, dropping by more than a quarter. The most color popular varieties according to CFA registration data are seal point, blue point, flame point and tortie point Himalayan, followed by black-white, shaded silvers and calico. The breed standards of various cat fancier organizations may treat the Himalayan and Exotic
Fixed-point combinator grammar, transitive closure, and other types of closure operations. A function for which "every" input is a fixed point is called an identity function. Formally: In contrast to universal quantification over all formula_53, a fixed point combinator constructs "one" value that is a fixed point of formula_57. The remarkable property of a fixed point combinator is that it constructs a fixed point for an "arbitrary given" function formula_57. Other functions have the special property that after being applied once, further applications don't have any effect. More formally: Such functions are called idempotent (see also projection). An example of such a