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Oct 6, 2020 at 12:42 history edited Robert Bryant CC BY-SA 4.0
Added a note explaining why the answer is still here, even though the question has been changed.
Oct 6, 2020 at 12:30 comment added YCor It also reveals a gap in convenientness of established terminology: ambiguity for "projective" (given closed subvariety of projective space / embeddable as such a closed subvariety), ambiguity for "defined over $\mathbf{Q}$" (used both for "defined over $\mathbf{Q}$" [endowed with a $\mathbf{Q}$-structure] and "definable over $\mathbf{Q}$")...
Oct 6, 2020 at 11:29 history answered Robert Bryant CC BY-SA 4.0