discrimination

n 1: unfair treatment of a person or group on the basis of

prejudice [syn: {favoritism}, {favouritism}]

2: the cognitive process whereby differences between two or

more stimuli are perceived

discriminated union

The discriminated union of two sets A and B is

A : B ◦ {(inA, a) | a in A} U {(inB, b)| b in B}

where inA and inB are arbitrary tags which specify which

summand an element originates from.

A {type} (especially an {algebraic data type}) might be

described as a discriminated union if it is a {sum type} whose

objects consist of a tag to say which part of the union they

belong to and a value of the corresponding type.

(1995-04-25)