Brown representability for the dual
A. Neeman

Abstract.

Let $\cal T$ be the homotopy category of all spectra. Brown proved that
a homological functor $H:{\cal T}^{op} \longrightarrow {\cal Ab}$ is
representable if it takes coproducts to coproducts. That is, the functors
$[-,h]$ may be characterised as the homological functors taking coproducts
to products.

In this article, we will prove the dual. A covariant functor 
$H:{\cal T} \longrightarrow {\cal Ab}$ which takes products to products
is representable; it is of the form $[h,-]$.