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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
 with the partial sum sn, is called summable (J, pn, qn) to s, and we write  if the series
 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.
 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.