Abstract
The Holditch Theorems for the euclidian plane and the euclidian sphere are generalized for the euclidian space. If we move a hyperbolic linear congruence of linesN along a closed ruled surfaceX, each line ofN generates a closed ruled surfaceY. Some global invariants ofY are linear functions of some global invariants ofX.
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Herrn Prof. Dr. K. Strubecker zum 70. Geburtstag gewidmet
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Hoschek, J. Eine Verallgemeinerung des Satzes von Holditch. Monatshefte für Mathematik 80, 93–99 (1975). https://doi.org/10.1007/BF01339077
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DOI: https://doi.org/10.1007/BF01339077