involutory collineation

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Collineation — In projective geometry, a collineation is a one to one and onto map (a bijection) from one projective space to another, or from a projective space to itself, such that the images of collinear points are themselves collinear. All projective linear … Wikipedia
Correlation (projective geometry) — This article is about correlation in projective geometry. For other uses, see correlation (disambiguation). A correlation is a duality (collineation from a projective space onto its dual space, taking points to hyperplanes (and vice versa) and… … Wikipedia

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