Geodesic
Normal Functions and Non-Tangential Boundary Arcs
Canadian journal of mathematics, Tome 18 (1966) no. 1, pp. 256-264

Voir la notice de l'article provenant de la source Cambridge University Press

Let D and C denote respectively the open unit disk and the unit circle in the complex plane. Further, γ = z(t), 0 ⩽ t ⩽ 1, will denote a simple continuous arc lying in D except for Ƭ = z(l) ∈ C, and we shall say that γ is a boundary arc at Ƭ.We use extensively the notions of non-Euclidean hyperbolic geometry in D and employ the usual metric where a and b are elements of D. For a ∈ D and r > 0 let For details we refer the reader to (4). 
Lappan, P.; Rung, D. C. Normal Functions and Non-Tangential Boundary Arcs. Canadian journal of mathematics, Tome 18 (1966) no. 1, pp. 256-264. doi: 10.4153/CJM-1966-028-9
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