Noun
summability (usually uncountable, plural summabilities)
(mathematics) The condition of being summable.
A summability method is such an assignment of a limit to a subset of the set of divergent series which properly extends the classical notion of convergence. Source: Internet
The lack of convergence of the Fourier series has led to the introduction of a variety of summability methods in order to produce convergence. Source: Internet
The Silverman–Toeplitz theorem characterizes matrix summability methods, which are methods for summing a divergent series by applying an infinite matrix to the vector of coefficients. Source: Internet