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Metric fibrations of Lobachevsky-Bolyai space. (English) Zbl 0793.53031
Szenthe, J. (ed.) et al., Differential geometry and its applications. Proceedings of a colloquium, held in Eger, Hungary, August 20-25, 1989, organized by the János Bolyai Mathematical Society. Amsterdam: North- Holland Publishing Company. Colloq. Math. Soc. János Bolyai. 56, 223-230 (1992).
Let \(x\), \(y\), \(u\), \(v\) be coordinates for \(H^ 2\times H^ 2\), where \(H^ 2\) is the hyperbolic plane, \(x,y\) \((u,v)\) are horocyclic coordinates in the first (second) factor. The authors introduce metric fibrations (i.e. partitions of a metric space by isometric and locally equidistant subsets) \[ H^ 2\times H^ 2= \bigcup_ c \text{Sol}_ c, \qquad \text{Sol}_ c= \bigcup_{a+b=c} M_{a,b} \] (where \(\text{Sol}_ c= (y+v=c\}\) is an Sol-manifold from the 8 homogeneous 3- dimensional manifolds in Thurston classification, \(M_{a,b}= \{y=a, v=b\}\) is called homogeneous horotorus) and compare them with the metric fibrations of the second author [Sov. Math., Dokl. 38, 202-205 (1989); translation from Dokl. Akad. Nauk SSSR 301, No. 6, 1301-1304 (1988; Zbl 0681.53006)] \[ H^ 2\times H^ 2= \bigcup_ c H_ c^ 3, \qquad H_ c^ 3= \bigcup_{a-b=c} M_{a,b} \] (in hyperbolic 3-space \(H_ c^ 3= \{y-v=c\}\), \(M_{a,b}\) is an horosphere). The paper also contains a survey on metric fibrations of \(R^ n\) and \(H^ n\).
For the entire collection see [Zbl 0764.00002].

MSC:
53C12 Foliations (differential geometric aspects)
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