Let D CRP be an open set, f:D +R be a continuous function, then ckeck that image f(A) of open subset AC D is open.
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Let D CRP be an open set, f:D +R be a continuous function, then ckeck that image f(A) of open subset AC D is open.
Let D CRP be an open set, f:D +R be a continuous function, then ckeck that image f(A) of open subset AC D is open.
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