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 and 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