Real point
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In geometry, a real point is a point in the complex projective plane with homogeneous coordinates (x,y,z) for which there exists a nonzero complex number λ such that λx, λy, and λz are all real numbers.
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This definition can be widened to a complex projective space of arbitrary finite dimension as follows:
are the homogeneous coordinates of a real point if there exists a nonzero complex number λ such that the coordinates of
are all real.
A point which is not real is called an imaginary point.[1]