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discriminated union

discriminated union in Technology
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.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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