## Algebraic & Geometric Topology

### Duality and Pro-Spectra

#### Abstract

Cofiltered diagrams of spectra, also called pro-spectra, have arisen in diverse areas, and to date have been treated in an ad hoc manner. The purpose of this paper is to systematically develop a homotopy theory of pro-spectra and to study its relation to the usual homotopy theory of spectra, as a foundation for future applications. The surprising result we find is that our homotopy theory of pro-spectra is Quillen equivalent to the opposite of the homotopy theory of spectra. This provides a convenient duality theory for all spectra, extending the classical notion of Spanier-Whitehead duality which works well only for finite spectra. Roughly speaking, the new duality functor takes a spectrum to the cofiltered diagram of the Spanier-Whitehead duals of its finite subcomplexes. In the other direction, the duality functor takes a cofiltered diagram of spectra to the filtered colimit of the Spanier-Whitehead duals of the spectra in the diagram. We prove the equivalence of homotopy theories by showing that both are equivalent to the category of ind-spectra (filtered diagrams of spectra). To construct our new homotopy theories, we prove a general existence theorem for colocalization model structures generalizing known results for cofibrantly generated model categories.

#### Article information

Source
Algebr. Geom. Topol., Volume 4, Number 2 (2004), 781-812.

Dates
Received: 7 August 2004
Accepted: 31 August 2004
First available in Project Euclid: 21 December 2017

Permanent link to this document
https://projecteuclid.org/euclid.agt/1513882531

Digital Object Identifier
doi:10.2140/agt.2004.4.781

Mathematical Reviews number (MathSciNet)
MR2100680

Zentralblatt MATH identifier
1054.55010

#### Citation

Christensen, J Daniel; Isaksen, Daniel C. Duality and Pro-Spectra. Algebr. Geom. Topol. 4 (2004), no. 2, 781--812. doi:10.2140/agt.2004.4.781. https://projecteuclid.org/euclid.agt/1513882531

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