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Definition: Perspectivitiescontributed 5 months ago by bookofproofs
Definition: Incidencecontributed 5 months ago by bookofproofs
Definition: Collinear Pointscontributed 5 months ago by bookofproofs
(related to "Existence and Uniqueness of a Straight Line Through Two Points")
(related to "Equivalence of Different Descriptions of a Straight Line Using Two Vectors")

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