hey guys(adsbygoogle = window.adsbygoogle || []).push({});

im trying to prove a fact. it is supposed to be really easy but im having some trouble. this is it:

http://en.wikipedia.org/wiki/Topological_manifold

"It follows from invariance of domain that Euclidean neighborhoods are always open sets."

Invariance of Domain - http://en.wikipedia.org/wiki/Invariance_of_domain

could anyone help out ?

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# Euclidean Neighbourhoods are always open sets

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