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coalesced sum

coalesced sum in Technology
theory
(Or "smash sum") In domain theory, the coalesced sum of domains A and B, A (+) B, contains all the non-bottom elements of both domains, tagged to show which part of the sum they come from, and a new bottom element.
D (+) E = bottom(D(+)E) U (0,d) | d in D, d /= bottom(D) U (1,e) | e in E, e /= bottom(E)
The bottoms of the constituent domains are coalesced into a single bottom in the sum. This may be generalised to any number of domains.
The ordering is
bottom(D(+)E) (i,v1) "LaTeX \sqsubseteq and "(+)" as LaTeX \oplus - a "+" in a circle.
(1994-12-22)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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