When an hyperboloid of revolution of one sheet is deformed into another ruled surface, the circle of gorge becomes a Bertrand curve and the generators are parallel to the corresponding binormals of the conjugate Bertrand curve.

— Luther P. Eisenhart A Treatise on the Differential Geometry of Curves and Surfaces (1909)

More quotes by Luther P. Eisenhart

A Treatise on the Differential Geometry of Curves and Surfaces (1909)

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