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circular points at infinity
In projective geometry, the circular points at infinity (also called cyclic points or isotropic points) are two special points at infinity in the complex projective plane that are contained in the complexification of every real circle.
==Coordinates==
The points of the complex plane may be described in terms of homogeneous coordinates, triples of complex numbers (''x'': ''y'': ''z''), with two triples describing the same point of the plane when one is a scalar multiple of the other. In this system, the points at infinity are the ones whose ''z''-coordinate is zero. The two circular points are the points at infinity described by the homogeneous coordinates
:(1: i: 0) and (1: −i: 0).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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