Hi everybody, I want to ask if there are big differences consider algebraic objects in the projective or in the projective space with only positive coordinates? I know that the question is generic (so permit the discussion ... ). I am interested to know what happen to classical invariants if someone has informations ...(adsbygoogle = window.adsbygoogle || []).push({});

Thank you in advance.

Ssnow

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# I Difference between the projective space and one its part

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