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Answer by Matthew C for Counter example of continous function such that there is Set S with $f(S)^\circ \subset (f(S^\circ))$

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This may be overkill, but the cantor function with $S=$ the middle-thirds cantor set will work:

2 properties of this function are: $S^\circ = \emptyset$ and $f(S)=[0,1]$


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