Geodesic
Some Remarks on Angular Derivatives and Julia's Lemma
Canadian mathematical bulletin, Tome 9 (1966) no. 2, pp. 233-241

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

Let w = f(z) be holomorphic on the unit disk D = { z: | z | < 1}, with the additional restrictions that | f ( z ) | < l and , where denotes the (outer) angular limit of f (z) at z = 1. Let us now define and then focus our attention on the behaviour of g(z) in an arbitrary angular neighbourhood of z = 1. Whenever exists, this limit is commonly referred to as the angular derivative of f(z) at z = 1. 
Jackson, H. L. Some Remarks on Angular Derivatives and Julia's Lemma. Canadian mathematical bulletin, Tome 9 (1966) no. 2, pp. 233-241. doi: 10.4153/CMB-1966-032-3
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