The Stacks project

Remark 15.75.16. Let $A$ be a ring. Let $K \in D(A)$ be perfect. If $K$ has tor-amplitude in $[a, b]$ then its dual $K^\vee $ has tor-amplitude in $[-b, -a]$. This follows from the last statement in Lemma 15.75.2 and the description of $K^\vee $ in the proof of Lemma 15.75.15.

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