Orthogonal Involution

Orthogonal involution, also called absolute involution, is the involution on the line at infinity that maps orthogonal directions to each other.

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This entry contributed by Floor van Lamoen

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van Lamoen, Floor. "Orthogonal Involution." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/OrthogonalInvolution.html

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