Let R (the set of real numbers) be equipped with the Euclidean topology and let S = {0, 1, 1/2, 1/3, ..., 1/n, ...}. Then * %3D O Sis clopen in R S is closed but not open in R O S is neither open nor closed in R O sis open but not closed in R

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.