On the focal surfaces of the congruences of tangents to a given surface

An edition of On the focal surfaces of the congruences of tangents to a given surface (1897)

On the focal surfaces of the congruences of tangents to a given surface.

By Alexander Pell

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Publish Date

1897

Publisher

The Friedenwald company

Language

eng

Pages

Description:

subjects: Congruences (Geometry)