Geodesic
Summability Tests for Singular Points
Canadian mathematical bulletin, Tome 15 (1972) no. 4, pp. 525-528

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

King [5] devised two tests for determining when z = 1 is a singular point of the function f(z) defined by 1 having radius of convergence equal to one. The point z = 1 and radius of convergence one may be chosen without loss of generality. 
Hartmann, F. W. Summability Tests for Singular Points. Canadian mathematical bulletin, Tome 15 (1972) no. 4, pp. 525-528. doi: 10.4153/CMB-1972-092-4
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