Geodesic
Hyperbolic angle function in the Lorentzian plane
Kragujevac Journal of Mathematics, Tome 28 (2005) no. 1.

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HYPERBOLIC ANGLE FUNCTION IN THE LORENTZIAN PLANEEmilija Nesovic Faculty of Science, P. O. Box 60, 34000 Kragujevac,Serbia and Montenegro (e-mails: emines@ptt.yu,  emilija@kg.ac.yu) Abstract. In this paper, using definitions of oriented hyperbolic angles between non-null vectors, we prove some theorems related to the angles in a triangle in the Lorentzian plane. 
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Emilija Nešović. Hyperbolic angle function in the Lorentzian plane. Kragujevac Journal of Mathematics, Tome 28 (2005) no. 1. http://geodesic.mathdoc.fr/item/KJM_2005_28_1_a9/