i know if every simple closed curve in D can be contracted to a point it is simply connected as in the case of|R^2 Domain or R^3 it is simply connected(adsbygoogle = window.adsbygoogle || []).push({});

but i am not feeling uncomfortable with |R^3 especially with the domains like when x =! 0 and y =! 0 why it is not simply connected?

how do I should visualize a closed curve with the domain in 3D?

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# Simply connecting curves

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