Who invented projective space $\mathbb{P}^n$ as an extension of the usual affine space $\mathbb{A}^n$?
Who was the first person to consider projective closures of plane affine algebraic curves (curves in $\mathbb{A}^2$)? Was it the same person?
Who invented projective space $\mathbb{P}^n$?
Maxim Leyenson
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