The moment problem, also called "Hausdorff's moment problem" or the "little moment problem," may be stated as follows. Given a sequence of numbers , under what conditions is it possible to determine a function of bounded variation in the interval such that
for , 1, .... Such a sequence is called a moment sequence, and Hausdorff (1921ab) was the first to obtain necessary and sufficient conditions for a sequence to be a moment sequence.