He gets only the positive vectors. But I don't get which is not a vector space. What I understand is vector space maybe a R^2, R^3 or R^n.(adsbygoogle = window.adsbygoogle || []).push({});

Can anyone here explain it more clearly? I don't get what he said.

http://www.youtube.com/watch?v=JibVXBElKL0" @ 29:55

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# What's a vector space and not?

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