Here are some definitions:
A topological space S is connected if emptyset and S are the only subsets of S that are both open and closed. A subset of S is connected if it is connected in the relative topology, A component, B, of S, is a nonempty connected subset of S such that the only connected subset of S constaining B is B itself.
The question is: is B open and closed in both the relative topology of B, and also in S?
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