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Desargues's theorem
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==The little Desargues theorem== This restricted version states that if two triangles are perspective from a point on a given line, and two pairs of corresponding sides also meet on this line, then the third pair of corresponding sides meet on the line as well. Thus, it is the specialization of Desargues's Theorem to only the cases in which the center of perspectivity lies on the axis of perspectivity. A [[Moufang plane]] is a projective plane in which the little Desargues theorem is valid for every line.
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