Geodesic
On a~theorem of Saff
Sbornik. Mathematics, Tome 23 (1974) no. 1, pp. 149-154

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

A theorem establishing a connection between the degree of best approximation by rational functions with a fixed number of free poles and the regions of meromorphy of a given function is proved. Bibliography: 3 titles. 
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     author = {A. A. Gonchar},
     title = {On a~theorem of {Saff}},
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     number = {1},
     year = {1974},
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A. A. Gonchar. On a~theorem of Saff. Sbornik. Mathematics, Tome 23 (1974) no. 1, pp. 149-154. http://geodesic.mathdoc.fr/item/SM_1974_23_1_a7/