- #1
Jamin2112
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- 12
Homework Statement
As the title says
Homework Equations
Definitions of "open" and "closed"
The Attempt at a Solution
Suppose a finite set S is not closed. Then Sc is not open, and there exists an element x of Sc, so that for all µ > 0, either x + u, or x - u, is an element of S.
Hmmm ... Where do I go from here? I need a springboard.