Anallagmatic geometry

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A geometry that studies the properties of figures which are invariant with respect to circle transformations (cf. Circle transformation) of the extended plane, i.e. of the Euclidean plane completed by a point at infinite distance.

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Anallagmatic geometry. Encyclopedia of Mathematics. URL:
This article was adapted from an original article by A.B. Ivanov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article