C hapter 1 of Kelley’s famous book General Topology introduces the most fundamental concepts of a topological space. One such notion is defined as follows [1]: A topological space (X, τ) is connected if and ony if X is not the union of two nonvoid separated subsets, where A and B are separated in X if and only if A∩ B = œ and A∩ B = œ. As usual, Y denotes the closure of a subset Y of X. Kelley’...

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