circle inversion

Fetched 2026-10-26 (cache).

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Noun

1. {{label|en|geometry|inversive geometry|for a given circle with centre O and radius r}} A [[transformation]] that maps any point ''P'' ≠ ''O'' to the point ''P’'' on the ray from ''O'' through ''P'' for which ''OP'' × ''OP’'' = ''r''², and which maps ''O'' to the [[point at infinity]].

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