If Y is a subspace of X, a separation of Y is a pair of disjoint non-empty sets A and B whose union is Y.
From above statement, I am not sure whether pair of disjoint non-empty sets A, B are open sets in subspace of Y or they are open in X.
2026-05-16 08:06:39.1778918799
Contentedness of subspace Y of X in general case.
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