Given a homeomorphism from a subspace of [tex]R^n[/tex] onto a subspace of [tex]R^n[/tex](adsbygoogle = window.adsbygoogle || []).push({});

if one of the subspaces is open in [tex]R^n[/tex], is the other one open in [tex]R^n[/tex] too?

I know it is trivial, but I can't see any solution.

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# Topology problem No. 2

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