This tract develops the purely mathematical side of the theory of
probability, without reference to any applications. When originally
published, it was one of the earliest works in the field built on the
axiomatic foundations introduced by A. Kolmogoroff in his book
Grundbegriffe der Wahrscheinlichkeitsrechnung, thus treating the subject
as a branch of the theory of completely additive set functions. The
author restricts himself to a consideration of probability distributions
in spaces of a finite number of dimensions, and to problems connected
with the Central Limit Theorem and some of its generalizations and
modifications. In this edition the chapter on Liapounoff's theorem has
been partly rewritten, and now includes a proof of the important
inequality due to Berry and Esseen. The terminology has been modernized,
and several minor changes have been made.