Question: : Let f : R - R defined as f(x) = if re Q -r otherwise . Make a sketch of the graph of the

: Let f : R - R defined as f(x) =

: Let f : R - R defined as f(x) = if re Q -r otherwise . Make a sketch of the graph of the function. . Prove that if x # 0, then f is not continuous at r. . Prove that f is continuous at 0

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