Английская Википедия:Complex line
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In mathematics, a complex line is a one-dimensional affine subspace of a vector space over the complex numbers.[1][2] A common point of confusion is that while a complex line has dimension one over C (hence the term "line"), it has dimension two over the real numbers R, and is topologically equivalent to a real plane, not a real line.[3]
The "complex plane" commonly refers to the graphical representation of the complex line on the real plane, and is thus generally synonymous with the complex line, and not a two-dimensional space over the complex numbers.
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