Coefficient multipliers on Banach spaces of analytic functions

Óscar Blasco, Miroslav Pavlović
2011 Revista matemática iberoamericana  
Motivated by an old paper of Wells [J. London Math. Soc. 2 (1970), 549-556] we define the space X ⊗Y , where X and Y are "homogeneous" Banach spaces of analytic functions on the unit disk D, by the requirement that f can be represented as f = ∞ j=0 gn * hn, with gn ∈ X, hn ∈ Y and ∞ n=1 gn X hn Y < ∞. We show that this construction is closely related to coefficient multipliers. For example, we prove the formula ((X ⊗ Y ), Z) = (X, (Y, Z)), where (U, V ) denotes the space of multipliers from U
more » ... V , and as a special case (X ⊗ Y ) * = (X, Y * ), where U * = (U, H ∞ ). We determine H 1 ⊗ X for a class of spaces that contains H p and p (1 ≤ p ≤ 2), and use this together with the above formulas to give quick proofs of some important results on multipliers due to Hardy and Littlewood, Zygmund and Stein, and others.
doi:10.4171/rmi/642 fatcat:sze4gvfcjzf2vmteloo6yesgny