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From Pre-triangulation to Triangulation: Obstructions and Exact Lifting

He, Ping et al.
arXiv (All) · Papers
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category-theoryrepresentation-theory
We give a new equivalent formulation of Verdier's octahedral axiom. An initial square in a pre-triangulated category determines an obstruction in a quotient of ordinary Hom groups. Its vanishing is equivalent to the existence of a good completion, and $\mathrm{TR4}$ is equivalent to this vanishing f
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