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Zbl 1129.30027
Ungar, Abraham A.
The hyperbolic square and Möbius transformations. (English)
[J] Banach J. Math. Anal. 1, No. 1, 101-116, electronic only (2007). ISSN 1735-8787/e

From the summary: Möbius transformations of the open unit disc of the complex plane and, more generally, of the open unit ball of any real inner product space, give rise to Möbius addition in the ball. The latter, in turn, gives rise to Möbius gyrovector spaces that enable the Poincaré ball model of hyperbolic geometry to be approached by gyrovector spaces, in full analogy with the common vector space approach to the standard model of Euclidean geometry. The purpose of this paper is to employ the Möbius gyrovector spaces for the introduction of the hyperbolic square in the Poincaré ball model of hyperbolic geometry. We find that the hyperbolic square is richer in structure than its Euclidean counterpart.

MSC 2000:: *30F45 Conformal metrics
20N05 Loops (group theory)

Keywords: Möbius gyrovector space; Poincaré ball

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