Question: D 5. Let f : R - R be continuous. Show that (x : f(x) > 0) is an open subset of R and that

D 5. Let f : R - R be continuous. Show

that (x : f(x) > 0) is an open subset of R

D 5. Let f : R - R be continuous. Show that (x : f(x) > 0) is an open subset of R and that (x : f(x) = 0) is a closed subset of R

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