A. E. Taylor, A Theorem Concerning Analytic Continuation for Functions of Several Complex Variables, Annals of Mathematics, Vol. 40, No. 4 (Oct., 1939), pp. 855-861 ...

Universality Theorem: A theorem asserting that shifts of a given function, such as ζ (s), can uniformly approximate any non-vanishing analytic function in certain domains.

Analytic functions, defined by the property of being locally expressible as convergent power series, form a cornerstone of complex analysis. Differential operators, which act on these functions by ...