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Wiedersehen Pair


Two points P,Q on a compact Riemann surface such that P lies on every geodesic passing through Q, and conversely. An oriented surface where every point belongs to a Wiedersehen pair is called a Wiedersehen surface.

The name is the German word for "seeing again" and was introduced by Blaschke.


See also

Wiedersehen Surface

This entry contributed by Margherita Barile

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References

Blaschke, W. Vorlesung über Differentialgeometrie I. Berlin: Springer-Verlag, 1921.Klingenberg, W. Course in Differential Geometry. New York: Springer-Verlag, p. 164, 1978.

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Wiedersehen Pair

Cite this as:

Barile, Margherita. "Wiedersehen Pair." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/WiedersehenPair.html

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