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Some Darboux motion on unit dual sphere and in space.

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Pure Appl. Math. Sci., 42 (1-2): 97-104 (1995)

Аннотация

The Darboux rotation for a curve on the dual unit sphere is decomposed into two simultaneous dual rotations. Then the spatial motion corresponding these dual motions can also be decomposed into two motions, a rotation and a general motion, in space. These decompositions of the dual Darboux rotations and spatial motions yield to some necessary conditions for a dual curve and ruled surface to be closed.

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