The purpose of this paper is to
study inclusion theorems for some of the more familiar sequence spaces. Necessary
and sufficient conditions are given for an FK-space to contain each of the spaces bv0,
bv, lp,0 < p < ∞, and c0. It is also shown that the Hardy space Hp,0 < p < 1, is a
barrelled subspace of its containing Banach space Bp. This leads to new results
concerning multipliers of Hp and to new estimates on the growth of the Taylor
coefficients of Bp functions.