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1 definition found
From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
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)