最終更新日：2022/12/24
By way of an example, we consider in detail the complex projective line C ℙ¹. […] Thus via the function w_0 the complex projective line C ℙ¹ becomes identified with the extended complex plane
(i.e. the ordinary complex plane with an additional point at infinity
).
2..2.1 Theorem The complex projective line C ℙ¹ is diffeomorphic to the 2-dimensional sphere S².
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