Summability of alterations of convergent series
Thomas A. Keagy · International Journal of Mathematics and Mathematical Sciences · 1981
The effect of splitting, rearrangement, and grouping series alterations on the summability of a convergent series by ℓ − ℓ and cs − cs matrix methods is studied. Conditions are determined that guarantee the existence of alterations that are transformed into divergent series and into series with preassigned sums.