Circular points

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cyclic points, on the plane completed by imaginary points at infinity

The two imaginary points at infinity whose homogeneous coordinates $(1,i,0)$ and $(1,-i,0)$ satisfy the equation of any circle. Straight lines passing through circular points are known as isotropic lines.

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Circular points. Encyclopedia of Mathematics. URL:
This article was adapted from an original article by BSE-2 (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article