Geodesic
On the five-point theorems due to Lappan
Yan Xu1
1 Department of Mathematics Nanjing Normal University Nanjing 210046, P.R. China
Annales Polonici Mathematici, Tome 101 (2011) no. 3, pp. 227-235.

Voir la notice de l'article provenant de la source Institute of Mathematics Polish Academy of Sciences

By using an extension of the spherical derivative introduced by Lappan, we obtain some results on normal functions and normal families, which extend Lappan's five-point theorems and Marty's criterion, and improve some previous results due to Li and Xie, and the author. Also, another proof of Lappan's theorem is given.
DOI : 10.4064/ap101-3-3
Keywords: using extension spherical derivative introduced lappan obtain results normal functions normal families which extend lappans five point theorems martys criterion improve previous results due xie author another proof lappans theorem given

Yan Xu 1

1 Department of Mathematics Nanjing Normal University Nanjing 210046, P.R. China 
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Yan Xu. On the five-point theorems due to Lappan. Annales Polonici Mathematici, Tome 101 (2011) no. 3, pp. 227-235. doi : 10.4064/ap101-3-3. http://geodesic.mathdoc.fr/articles/10.4064/ap101-3-3/

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