Published online by Cambridge University Press: 20 November 2018
We consider the group Ta, its group of characters Za, and an arbitrary order P on Za. For x ∊ Za, let sgnpx be 1, - 1 , or 0 according as x € P\{0}, x € (-P)\{0}, or X = 0. For f in Lp(Ta), 1 < p < ∞, it is known that there is a function in Lp(Ta) such that
for all X in Za. Summability methods for
are also available. In this paper, we obtain summability methods for
that apply for
in L1(Ta), and we show how various properties of
can be derived from our construction.