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6 - The Triangulated Homotopy Category

Published online by Cambridge University Press:  19 December 2024

James Gillespie
Affiliation:
Ramapo College of New Jersey
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Summary

This chapter is devoted to studying the triangulated structures that can be attached to an abelian model structure on a weakly idempotent complete exact category. First, one-sided (i.e. left and right) triangulated categories are defined and it is shown that we can attach both a left and right triangulated category to any complete cotorsion pair. It is then shown that the homotopy category of an abelian model structure is always triangulated. In particular, the suspension functor is an autoequivalence of the homotopy category. Natural descriptions of the distinguished triangles are given. Ultimately, it is shown that the canonical functor to the homotopy category may be thought of as the triangulated localization of the exact structure with respect to the class of trivial objects.

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Publisher: Cambridge University Press
Print publication year: 2025

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