ON A STRANGE HOMOTOPY CATEGORY

摘要

Let C $$ mathcal{C} $$ be an additive category in which each morphism has a kernel. It is proved that the homotopy category of the category of complexes over C $$ mathcal{C} $$ which are concentrated in degrees 2, 1, 0 and are exact in degrees 2 and 1 is Abelian. Under assumption that a category C $$ mathcal{C} $$ is Abelian, this result was obtained earlier by considering the heart of a suitable t-structure on the homotopy category of C $$ mathcal{C} $$ .