Geodesic
Extended Hyperbolic Surfaces in~$R^3$
Informatics and Automation, Geometric topology and set theory, Tome 247 (2004), pp. 267-279.

Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper, I will describe the construction of several surfaces whose intrinsic geometry is hyperbolic geometry, in the same sense that spherical geometry is the geometry of the standard sphere in Euclidean 3-space. I will prove that the intrinsic geometry of these surfaces is, in fact, (a close approximation of) hyperbolic geometry. I will share how I (and others) have used these surfaces to increase our own (and our students') experiential understanding of hyperbolic geometry. (How to find hyperbolic geodesics? What are horocycles? Does a hyperbolic plane have a radius? Where does the area formula $\pi r^2$ fit in hyperbolic geometry?). 
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D. W. Henderson. Extended Hyperbolic Surfaces in~$R^3$. Informatics and Automation, Geometric topology and set theory, Tome 247 (2004), pp. 267-279. http://geodesic.mathdoc.fr/item/TRSPY_2004_247_a19/

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