A POWER series of the form?an(z - z0)n which converges at more than one point, converges inside a circle centre z0 and coincides with the series obtained by applying Taylor's theorem to the sum ...

Jim Agler, John E. McCarthy, N. J. Young, Operator monotone functions and Löwner functions of several variables, Annals of Mathematics, Second Series, Vol. 176, No ...

Hans Lewy, On the Local Character of the Solutions of an Atypical Linear Differential Equation in Three Variables and a Related Theorem for Regular Functions of Two Complex Variables, Annals of ...