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Published online by Cambridge University Press: 20 January 2009
In the following discussion we shall assume that pn≧0, qn≧0 for all n and that qn + 1 > qn → ∞. The (J, pn, qn) method of summation is defined as follows.
The series
with the partial sum sn, is called summable (J, pn, qn) to s, and we write
if the series

and
converge to the sum functions p*(x) and p(s)(x) respectively for 0<x<1 and if τ(x) = p(s)(x)/p*(x)→s as x→1–0.