Problem 3. Show that in a general topological space (X, J) thata subset is closed if and only if its complement is open
Problem 3. Show that in a general topological space (X, 3) that a subset is closed if and only if its complement is open (note: we did this for R, but used an open ball in it-show that we don't need this!).
Problem 3. Show that in a general topological space (X, J) that a subset is closed if and only if its complement is open
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