Snowshoe cat very vocal, though their voices are not as loud as the Siamese, a cat found in their breed heritage. They are noted as being very intelligent and have the ability to learn tricks and open doors. These cats also enjoy water, and may swim. In the 1960s, a cat, owned by Siamese cat breeder Dorothy Hinds-Daugherty, produced a litter of Siamese kittens in Philadelphia, Pennsylvania. Three of the kittens had unique markings, consisting of white points and feet. Intrigued by their looks, she began working to breed cats like them, using seal point Siamese with bicolor American Shorthairs. The offspring
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