Fairly early in the development of the theory of summability of divergent series, the concept of convergence factors was recognized as of fundamental importance

This ENCYCLOPAEDIA OF MATHEMATICS aims to be a reference work for all parts of mathe matics. It is a translation with updates and editorial comments of the Sovi

Monthly journal devoted entirely to research in pure and applied mathematics, and, in general, includes longer papers than those in the Proceedings of the Ameri