According to this book I'm reading, if you cut out a closed disc in the projective plane, then the complement of the interior of this disc is topologically a Mobius strip with boundary.(adsbygoogle = window.adsbygoogle || []).push({});

Looking at the constructions of real projective space and the mobius strip from squares though, I can't see how this works?

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# Cutting a hole in the projective plane

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