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Actual analytic constructible sheaves admit coherent six operations

Statement

Assume AC (The Axiom of Choice) and let k be an arbitrary field. On separated finite-type complex varieties, the ordinary analytic sheaf operations restrict to bounded algebraically constructible complexes Dcb(−;k) (Algebraically constructible complexes of analytic field sheaves): f∗⊣Rf∗, Rf!⊣f!, the tensor/internal-Hom adjunction, coherent composition, support localization, ordinary and extraordinary proper base change, the projection formula and trace. Proper f satisfies Rf!=Rf∗. Verdier duality is involutive there and exchanges these adjoints. On a smooth complex d-fold ωX=kX[2d], and for a smooth map of relative dimension d, f!=f∗[2d]. Coefficient extensions commute with these operations on bounded constructible inputs. The bounded constructibility and finite coefficient models are those of Complex algebraic constructible complexes have finite conical cochain models and Finite simplicial constructible sheaves have an actual derived incidence model.

Facts & Assumptions

[F1]

The coherent six-operation theorem gives, on the proved constructible subcategory, the three adjunctions, composition and identity comparisons, ordinary and extraordinary proper base change, the projection formula, support localization, dualizing transitivity and trace, coherent under Cartesian pasting, composition, evaluation and trace, with proper equality Rf!=Rf∗, and with finite constructible models commuting with coefficient extension; geometric output preservation is the exact geometric supplier (Coherent six operations on analytic constructible field sheaves).

[F2]

The bounded constructibility and finite coefficient models are supplied by the finite conical and derived-incidence suppliers, for the stated finite collections, with coefficient-extension compatibility (Complex algebraic constructible complexes have finite conical cochain models, Finite simplicial constructible sheaves have an actual derived incidence model).

[F3]

The exceptional inverse image represents the Hom transposition on bounded sources and bounded-below targets and becomes the right adjoint Rf!⊣f! on the bounded constructible specialization (Exceptional inverse image as the adjoint of derived proper-support image).

[F4]

The constructible Verdier theorem gives involutive duality on bounded constructible objects, exchanging the adjoints, with ωX≃kX[2d] on a smooth complex d-fold and f!≃DXf∗DY, together with the coherent extraordinary proper exchange (Constructible Verdier duality and complex orientation).

[F5]

Dcb(X;k) consists of the bounded complexes whose cohomology is locally constant of finite rank along a finite smooth algebraic stratification (Algebraically constructible complexes of analytic field sheaves); AC is assumed (The Axiom of Choice).

Proof

technique · direct
1.1givenF1F2F3

The operations restrict to Dcb and satisfy the stated adjunctions and diagrams. The compact-support adjoint and the coherent six-operation suppliers [F1] construct the functors together with their adjunction units and counits, not merely unrelated isomorphisms: their composition, Cartesian exchange, projection, trace and localization diagrams are the asserted diagrams, including proper equality and the smooth local-product comparisons. The finite conical and incidence suppliers [F2] prove bounded constructibility and finite coefficient models for the stated finite collection, so the constructed operations restrict to Dcb; and [F3] supplies the right adjoint Rf!⊣f! on that specialization. All vector-space and injective constructions apply over an arbitrary field: the signed cochains use only 0 and the units ±1, so no characteristic hypothesis enters.

1.2givenF1F4F5

Proper equality and involutive duality. Proper f satisfies Rf!=Rf∗ by [F1]. The oriented stratified Verdier supplier [F4] gives the evaluation isomorphism and proves the natural evaluation A→DXDXA is an isomorphism on bounded constructible objects, so duality is involutive there; its adjunction construction gives the exchange of Rf∗, Rf! with the duality functors, and the extraordinary proper base change. All these maps use the same ordinary units, counits and orientation, so their coherence is the coherence of the actual construction and is compatible with the pasting and trace identities of [F1].

1.3givenF1F2F3F4

Smooth normalization and relative pullback. On a smooth complex d-fold the complex orientation identifies ωX≃kX[2d] by [F4]. Let a:X→Y be smooth of pure relative complex dimension d. Smooth analytic local charts identify it, locally on source and target, with pr⁡:W×V→V, where W is an oriented complex d-ball; V need not be smooth. For an open V′⊆V, the generator EW×V′=jW×V′!k has proper-support image EV′⊗kRΓc(W,k)=EV′[−2d], by the finite oriented ball relative-cochain model of [F2] and the support construction of [F1]. For any bounded constructible B on V, the ordinary product comparison of [F2] gives RΓ(W×V′,pr⁡∗B)=RΓ(V′,B) because W is contractible. Consequently RHom⁡(EW×V′,pr⁡∗B[2d])=RHom⁡(Rpr⁡!EW×V′,B). The orientation integration map Rpr⁡!pr⁡∗B[2d]→B transposes under [F3] to a comparison pr⁡∗B[2d]→pr⁡!B, and on these generators its Hom map is exactly the displayed cochain evaluation isomorphism, natural under shrinking product charts; the exceptional adjoint of [F3] identifies the same right-hand complex with RHom⁡(EW×V′,pr⁡!B). Product opens form a neighbourhood basis, so the comparisons identify derived sections and hence cohomology stalks, proving pr⁡!B≃pr⁡∗B[2d]. The positive complex orientation makes the local comparisons agree on overlaps, so they glue to a!≃a∗[2d] on all bounded constructible inputs. The orientation generator maps to 1∈k over every field, including characteristic two. This proves the relative formula on arbitrary constructible complexes rather than only on smooth local systems.

2.1givenF1F2F4∎

Coefficient extension. The finite local cellular and cochain models of [F2] have finite-dimensional terms and k-linear comparison maps, so extending scalars along k→K is exact, commutes with finite sums, cohomology and finite-dimensional duals, and carries the models of [F1] and [F4] to the corresponding models of the extended coefficient field; the exceptional comparison follows from f!=DXf∗DY, and composition and traces extend because their maps are the same finite evaluation and section comparisons. This does not assert that infinite products of injective stalks commute with scalar extension.

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