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Homework Statement
is it possible to have a topological space that is neither the indiscrete nor the discrete, and very set in the topology is clopen?
Homework Equations
The Attempt at a Solution
let ##X## = {(0,1),(2,3)} with the ordinary topology on R.
(0,1) is open, but it's complement which is (2,3) is open and which means (0,1) is closed. This (0,1) is clopen. Same argument for (2,3). Is this right?
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