. . . "convergent expansion" . "radii of convergence" . . "convergent" . . . "Region of convergence (ROC)" . "intervals of convergence" . . "radius of convergence" . "Radius of convergence" . "circle of convergence" . . . . "Radius_of_convergence" . . . "Radius of convergence#Domb\u2013Sykes plot" . "region of convergence" . . "Radius of convergence" . "disk of convergence" . . "ROC" . "disc of convergence" . .