<character> (Greek letter).

1. <unit> /micro/ prefix denoting division by 10^6, e.g. mu m (micrometre, a millionth part of a metre). Sometimes written as a 'u', the ASCII character nearest in appearance.

2. <mathematics> /myoo/ In the theory of functions, mu x . E denotes the least value of x for which E = x, i.e. the least fixed point of the function \ x . E. The recursive function mu f . H f satisfies (and is defined by) the equation

	mu f . H f = H (mu f . H f)
An alternative notation for the same function is

	fix H = H (fix H)
See fixed point combinator.

3. <database> multiple value.

[Jargon File]

Nearby terms:
MTS « MTTR « MTU « Mu » mu » MUA » MUCAL