Siamese cat including the Cornish Rex, Sphynx, Peterbald, and the blue point Siamese cat. The Siamese cat comes in two distinct variations: traditional, with an apple-shaped head and a slightly chubby body; or the modern Siamese, which are very skinny and have a wedge-shaped head. Both a description and depiction of the Wichienmaat (Siamese cat) first appears in a collection of ancient manuscripts called the Tamra Maew (The Cat-Book Poems) thought to originate from the Ayutthaya Kingdom (1351 to 1767 AD). Over a dozen are now kept in the National Library of Thailand, while others have resurfaced outside of Thailand and are
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