Exercise 18 Any subset E CS is contained in UsEE(s). Show that E is a down-set if and only if E = U(s]. sEE

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Exercise 18 Any subset E CS is contained in UsEE(s). Show that E is a
down-set if and only if
E = U(s].
sEE
Transcribed Image Text:Exercise 18 Any subset E CS is contained in UsEE(s). Show that E is a down-set if and only if E = U(s]. sEE
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