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John Toh
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Does a complete subalgebra A of a complete boolean B algebra always intersect all dense subsets of B?
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If X is a subset of a complete boolean algebra, must there be a finite $Y \subset X$ s.t. sup(Y) = sup(X)?
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Does a complete subalgebra A of a complete boolean B algebra always intersect all dense subsets of B?
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If X is a subset of a complete boolean algebra, must there be a finite $Y \subset X$ s.t. sup(Y) = sup(X)?
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