By Percival Frost Joseph Wolstenholme
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This completes the proof. 7). 3. We begin by reviewing some basic definitions from homological algebra. 1. Let A be an additive category. A chain complex with values in A is a composable sequence of morphisms d(2) d(1) d(0) · · · → A2 → A1 → A0 → A−1 → · · · in A such that d(n − 1) ◦ d(n) = 0 for every integer n. The collection of chain complexes with values in A is itself an additive category, which we will denote by Ch(A). For each integer n, we let Ch(A)≥n denote the full subcategory of Ch(A) spanned by those chain complexes A∗ where Ak 0 for k < n.
Let A be an additive category and let A• be a semisimplicial object of A. Fix n > 0. For each 0 ≤ i ≤ n, we let di : An → An−1 denote the associated face map (determined by the unique injective map [n − 1] → [n] whose image does not contain i ∈ [n]). Let d(n) : An → An−1 denote the alternating sum 0≤i≤n (−1)i di . An easy calculation shows that d(n − 1) ◦ d(n) 0 for n > 0, so that d(2) d(1) · · · → A2 → A1 → A0 → 0 → · · · is a chain complex with values in A. We will denote this chain complex by C∗ (A), and refer to it as the unnormalized chain complex associated to A• .
Let C be a stable ∞-category equipped with a t-structure. For each n ∈ Z, the full subcategory C≤n is a localization of C. Proof. Without loss of generality, we may suppose n = −1. 8, it will suffice to prove that for each X ∈ C, there exists a map f : X → X , where X ∈ C≤−1 and for each Y ∈ C≤−1 , the map MapC (X , Y ) → MapC (X, Y ) is a weak homotopy equivalence. 1, we can choose f to fit into a fiber sequence f X →X→X where X ∈ C≥0 . According to Whitehead’s theorem, we need to show that for every k ≤ 0, the map ExtkC (X , Y ) → ExtkC (X, Y ) is an isomorphism of abelian groups.