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5. Prove or disprove this assertion: Let x) be a. continuous function; let C = {x}: x ? 0}. Then C is closed. (Hint: In

5. Prove or disprove this assertion: Let x) be a. continuous function; let C = {x}: x ? 0}. Then C is closed. (Hint: In R1, look at f (x) = l/(l + x} for x ,2 0.)

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