The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Rectilinear Generatrix

(or rectilinear generator). The rectilinear generatrices of a surface are the infinite system of straight lines (or segments of straight lines) that make up the surface. Such a surface consisting of straight lines is said to be ruled. Surfaces with two sets of rectilinear generatrices are quadric surfaces.

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