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Projective coherent duality over a regular local base
Statement
Assume AC and DC. Let be regular Noetherian local of dimension , let be projective over , and fix . Put . Then is a dualizing complex on , with coherent biduality. For every bounded coherent complex on , trace/evaluation gives . The pairing, not just its vector-space shadow, is canonical for the supplied embedding.
Facts & Assumptions
Given: A regular Noetherian local ring of dimension , a projective -scheme with a fixed closed immersion , the complex , and a bounded coherent complex on .
def-axiom-of-choice. The Axiom of Choice (AC) is the following statement. > Every family of nonempty sets has a choice function > (def-choice-function). Written out: for every set all of whose members are nonempty, there exists a function with domain satisfying for all . (The Axiom of Choice)
def-dualizing-complex-on-projective-cm-scheme. A dualizing complex on a Noetherian scheme is an object such that, locally on affine open neighborhoods , its corresponding complex has finite injective dimension over and the homothety map is an isomorphism. (Dualizing complexes and the normalized dualizing sheaf on a projective CM scheme)
lem-relative-projective-space-derived-duality-regular-local-base. Assume AC and DC. Let be regular Noetherian local of finite dimension and . Write . Laurent residue gives . For every , evaluation followed by gives a natural quasi-isomorphism . (Relative derived duality on projective space over a regular local ring)
lem-finite-closed-immersion-derived-coinduction-adjunction. Assume AC. For a finite homomorphism of Noetherian rings and , the complex has its natural -action and is right adjoint to restriction of scalars. (Derived adjunction for finite rings and closed immersions)
lem-regular-quotient-dualizing-complex-and-biduality. Assume AC. Let be a regular Noetherian ring of finite dimension , let be an invertible -module, and let be nonzero. For any integer , is a dualizing complex over . (Dualizing complexes and coherent biduality for regular-ring quotients)
thm-localisation-and-polynomial-extension-of-regular-rings. Assume the Axiom of Choice (The Axiom of Choice). Localizations and finite polynomial extensions of a commutative regular Noetherian ring are regular. Regularity can equivalently be tested at maximal ideals. For every nonzero such ring, , allowing infinity. (localisation and polynomial extension of regular rings)
def-dependent-choice. Let be a set and let be a binary relation on . Call entire on when The Axiom of Dependent Choice, written , is the following statement. (The axiom of dependent choice: a relation in which every element is related to something admits an -indexed chain)
Proof
On an affine chart of the ring is a regular finite-dimensional polynomial ring over and is cut out by an ideal with ; the ambient twist is invertible, so the regular-quotient biduality supplier applies over and shows that produces a local dualizing complex with coherent biduality.
The coinduction adjunction for the closed immersion uses the natural quotient action and evaluation at one, so the local chart complexes and their biduality structures glue to a global dualizing complex on .
Uniform finite twist resolutions over bound the coherence degrees of applied to the finite twists, so is bounded with coherent cohomology.
Closed-immersion internal Hom adjunction identifies with , and closed-immersion cohomology comparison identifies the global sections of the two sides.
Applying the relative projective-space duality, shifted by , gives the natural quasi-isomorphism ; its trace is the coinduction counit followed by the Laurent residue, so it is the actual compatible composition pairing. Coherent biduality holds locally by step 1.1 and hence globally, and the Axiom of Choice and the Axiom of Dependent Choice are inherited from the cited suppliers.
Remarks
- The dualizing complex is defined from the fixed embedding; the statement is canonical for that embedding, not independent of it.
- The concentration of this complex into a single dualizing module on a normal surface modification is not asserted here.
Depends on
- The Axiom of Choice
- Dualizing complexes and the normalized dualizing sheaf on a projective CM scheme
- Relative derived duality on projective space over a regular local ring
- Derived adjunction for finite rings and closed immersions
- Dualizing complexes and coherent biduality for regular-ring quotients
- localisation and polynomial extension of regular rings
- The axiom of dependent choice: a relation in which every element is related to something admits an $\mathbb{N}$-indexed chain
Used by
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