Duality and small functors

The homotopy theory of small functors is a useful tool for studying various questions in homotopy theory. In this paper, we develop the homotopy theory of small functors from spectra to spectra, and study its interplay with Spanier-Whitehead duality and enriched representability in the dual category of spectra. We note that the Spanier-Whitehead duality functor \(D\colon \mathrm{Sp}\rightarrow \mathrm{Sp}^{\mathrm{op}}\) factors through the category of small functors from spectra to spectra and construct a new model structure on the category of small functors, which is Quillen equivalent to \(\mathrm{Sp}^{\mathrm{op}}\). In this new framework for the Spanier-Whitehead duality, \(\mathrm{Sp}\) and \(\mathrm{Sp}^{\mathrm{op}}\) are full subcategories of the category of small functors and dualization becomes just a fibrant replacement in our new model structure.