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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 leastfixed 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