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Pencil

The set of all lines through a point. The term was first used by Desargues (Cremona 1960, p. x). The six angles of any pencils of four rays are connected by the relationand the lengths satisfy(Lachlan 1893).Woods (1961) uses the term pencil as a synonym for line segment range, and Altshiller-Court (1979, p. 12) uses the term to mean sheaf of planes.

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