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A set S, a subset of D, is Scott-closed if
(1) If Y is a subset of S and Y is directed then lub Y is in S and
(2) If y <= s in S then y is in S.
I.e. a Scott-closed set contains the
s of its directed subsets and anything less than any element.
(2) says that S is downward closed (or left closed).
("<=" is written in
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