Top network posts

• 89 Infinite sets don't exist!?
• 48 When is the closure of an intersection equal to the intersection of closures?
• 45 Theorems with an extraordinary exception or a small number of sporadic exceptions
• 36 How to prove that $ \text{int}(\text{cl}(A)) = \text{cl}(\text{int}(A)) $?
• 34 An example of neither open nor closed set
• 30 Reference for general-topology
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