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TheoremStatement: Literature-sourcedProof: AI-adaptedPipeline-generatedprecheck passjudge pass (gpt-6.1-sol)audited 2026-10-02
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Basic Bochner–Kodaira–Morrey estimate on Cn

Statement

Assume the Axiom of Choice (AC). Let Ω⊆Cn be open with n≥1. Use one-based labels zj:=zj−1can for 1≤j≤n, also for their derivatives and form coefficients. Let φ∈C2(Ω;R), write

Dk:=∂∂zˉk,φj:=∂φ∂zj,φjkˉ:=∂2φ∂zj∂zˉk,

let 1≤q≤n, and let u be a compactly supported smooth (0,q)-form on Ω, with coefficients uJ on increasing tuples extended to non-increasing tuples by antisymmetry, so that ujJ=0 when j∈J (Weighted L2 spaces and maximal dbar operators); the operators ∂zj,∂zˉj are those of Wirtinger operators in Cm. All sums over multi-indices below run over increasing tuples, ⟨⋅,⋅⟩φ and ∥⋅∥φ are the inner product and norm of L0,∙2(Ω,e−φ), and ∂ˉφ∗ is the weighted Hilbert adjoint of ∂ˉq−1 (Weighted L2 spaces and maximal dbar operators).

  1. (Exact Bochner–Kodaira–Morrey form.) The following identity holds, all integrals being finite:

∥∂ˉu∥φ2+∥∂ˉφ∗u∥φ2=∑∣J∣=q ∑k=1n∫Ω∣DkuJ∣2 e−φ dV+∫Ω∑∣J∣=q−1 ∑j,k=1nφjkˉujJukJ‾ e−φ dV.

  1. (Levi inequality.) If in addition φ is plurisubharmonic on Ω, then

∥∂ˉu∥φ2+∥∂ˉφ∗u∥φ2 ≥ ∫Ω∑∣J∣=q−1 ∑j,k=1nφjkˉujJukJ‾ e−φ dV.

Facts & Assumptions

Given: The Axiom of Choice; an open set Ω⊆Cn with n≥1; a function φ∈C2(Ω;R); an integer 1≤q≤n; a compactly supported smooth (0,q)-form u; and the notation ej:=dzˉj, Dj:=∂zˉj, δj:=φj−∂zj acting coefficientwise, where the Wirtinger operators ∂zj,∂zˉj are those fixed in the Statement, so that the holomorphic derivative, and not Dj=∂zˉj, appears in δj; further εjf:=ej∧f on coefficient tensors, and (ιjw)K:=wjK for increasing K.

[F1]

The weighted inner product and norm on coefficient tuples of bidegree (0,q) are ⟨v,w⟩φ=∫Ω∑∣J∣=qvJwJ‾e−φdV and ∥v∥φ2=⟨v,v⟩φ (Weighted L2 spaces and maximal dbar operators).

[F2]

The distributional derivative of u∈L0,q2 is ∂ˉu=∑∣J∣=q∑j=1n(∂uJ/∂zˉj) dzˉj∧dzˉJ (Weighted L2 spaces and maximal dbar operators).

[F3]

The weighted adjoint is characterized by ⟨∂ˉq−1v,w⟩φ=⟨v,∂ˉφ∗w⟩φ for all v∈Dom⁡∂ˉq−1 and w∈Dom⁡∂ˉφ∗ (Weighted L2 spaces and maximal dbar operators).

[F4]

Coefficients are extended to non-increasing tuples by antisymmetry, so that vjK=0 when j∈K (Weighted L2 spaces and maximal dbar operators).

[F5]

The conventions L0,q2={0} and ∂ˉq=0 are in force for q<0 and for q>n (Weighted L2 spaces and maximal dbar operators).

[F6]

For 1≤q≤n every ψ∈Cc∞(Ω) of bidegree (0,q) lies in Dom⁡∂ˉφ∗, and (∂ˉφ∗ψ)K=∑j=1n(ψjKφj−∂zjψjK) (The maximal distributional dbar operator is closed and densely defined).

[F7]

Wedge multiplication of basis vectors is multilinear and alternating, so ei∧ei=0 and transposing two neighbouring entries changes the sign; it is also associative, and the strictly increasing monomials form a basis; hence for a distinct i and an increasing tuple I=(i1<⋯<ip) one has ei∧eI=(−1)#{ij<i}esort⁡({i}∪I), while ei∧eI=0 when i∈I (The basic wedge map (v1,…,vk)↦v1∧⋯∧vk is multilinear and alternating, Exterior multiplication is well defined, graded, associative, unital, and graded-commutative, Wedge monomials in a dual basis form a basis).

[F8]

The Levi form is Lu(a;v)=∑j=1m∑k=1m∂2u∂zj∂z‾k(a)vjvk‾ (The Levi form and strict plurisubharmonicity).

[F9]

A C2 real-valued function is plurisubharmonic if and only if its Levi form is pointwise semidefinite nonnegative (The C^2 Levi criterion for plurisubharmonicity).

[F10]

For a function with continuous second partial derivatives, ∂j∂iϕ=∂i∂jϕ (Continuous second partials of a scalar potential commute).

[F11]

On every measure space the complex L2 pairing is linear in the first variable, conjugate-linear in the second, conjugate symmetric and positive definite (The complex L2 pairing is well-defined and satisfies Cauchy–Schwarz).

[F12]

AC⇒DC⇒ACω in ZF (AC implies DC implies countable choice).

[F13]

The Axiom of Countable Choice ACω supplies a choice function for every at most countable family of nonempty sets (The Axiom of Countable Choice (ACω)).

[F14]

The Axiom of Choice supplies a choice function for every family of nonempty sets (The Axiom of Choice).

Choice use. AC is the ambient hypothesis recorded in the Statement and cited as [F14]; the countable instance [F13] is the form of choice consumed by the constructions behind [F1] (completeness and density of the weighted space) and [F6] (the maximal operator and its adjoint on compactly supported smooth forms), and [F12] is the exact implication AC ⇒ DC ⇒ ACω supplying it. The proof itself selects no family of nonempty sets: the form, its coefficients, the weight and the finitely many index sets in the sums are all given.

Proof

technique · direct
1.1F4F7givenalgebra

The notation of the given block is well defined on coefficient tensors, and for increasing L the sign rule [F7] gives ek∧eL=ϵ(k,L)eL∪k for k∉L and ek∧eL=0 for k∈L, while the antisymmetry convention [F4] gives ιjeL=ϵ(j,L∖j)eL∖j for j∈L and ιjeL=0 for j∉L, where ϵ(a,M):=(−1)#{m∈M: m<a}; consequently the Clifford relation ιjεk+εkιj=δjkid holds, because for j=k∈L one has ιjεjeL=0 and εjιjeL=eL, for j=k∉L one has ιjεjeL=eL and εjιjeL=0, for j≠k with j∉L both terms vanish since an index occurring twice wedges to zero, and for j≠k with j∈L the terms vanish when k∈L and otherwise cancel by the sign identity ϵ(k,L)ϵ(j,(L∖j)∪k)=−ϵ(j,L∖j)ϵ(k,L∖j), whose two exponents differ by exactly one because exactly one of j<k, k<j holds.

1.2F1F4F7F11givenalgebra

For coefficient tensors f of degree p and w of degree p+1 with compactly supported smooth coefficients, ⟨εjf,w⟩φ=⟨f,ιjw⟩φ: by [F11] both sides are sesquilinear in (f,w), and on constant basis tensors f=eI, w=eL the formulas above from [F7] and [F4] give (εjeI)L=ϵ(j,I)δL,I∪j and (ιjeL)I=ϵ(j,L∖j)δI,L∖j, which are equal since L=I∪j exactly when I=L∖j; multiplying the pointwise identity by the positive factor e−φ and integrating with the pairing of [F1] gives the weighted statement.

1.3F1F2F3F6F11givenalgebra

For all f,g∈Cc∞(Ω) one has ⟨Djf,g⟩φ=⟨f,δjg⟩φ, and hence also ⟨δjf,g⟩φ=⟨f,Djg⟩φ by conjugate symmetry; indeed, f is a compactly supported smooth (0,0)-form and gej a compactly supported smooth (0,1)-form lying in Dom⁡∂ˉφ∗ with ∂ˉφ∗(gej)=δjg by [F6], while [F2] gives ∂ˉf=∑kDkf ek, so the characterizing identity [F3] reads ∑kδkj⟨Dkf,g⟩φ=⟨f,δjg⟩φ.

1.4F2F6givenalgebra

On compactly supported smooth forms the operator identities ∂ˉ=∑kεkDk and ∂ˉφ∗=∑jιjδj hold pointwise in the increasing coefficients, the first because [F2] expands ∂ˉ as the sum of the wedges (DkuJ)ek∧eJ, and the second because the coefficient formula of [F6] is ∑jδj(ψjK) on each increasing K, which is what ∑jιjδj produces; consequently the self-adjoint-shaped operator □:=∂ˉφ∗∂ˉ+∂ˉ∂ˉφ∗ satisfies □=∑j,k(ιjδjεkDk+εkDkιjδj) on those forms.

2.1F10step 1.1step 1.4givenalgebra

The operator identity □=∑jδjDj+∑j,kφjkˉεkιj holds on compactly supported smooth forms: by the identities of step 1.4, the constant-coefficient form operators εk,ιj commute with the coefficientwise operators δj,Dk, and by the Clifford relation of step 1.1 one has ιjδjεkDk=ιjεkδjDk=δjkδjDk−εkιjδjDk and εkDkιjδj=εkιjDkδj, so □=∑jδjDj+∑j,kεkιj(Dkδj−δjDk); the commutator acting coefficientwise is the multiplication operator Dkφj, since the coefficientwise derivatives commute and only the term where Dk hits φj survives, and Dkφj=∂zˉk∂zjφ=φjkˉ by clairaut [F10].

2.2F1F3F5F6F11step 1.4givenalgebra

The left-hand side of claim 1 equals ⟨□u,u⟩φ: since u and its images are compactly supported smooth forms lying in the relevant domains, with ∂ˉu=0 by the degree convention [F5] when q=n, the characterizing adjoint identity [F3] applied to the pairs (u,∂ˉu) and (∂ˉφ∗u,u) gives ⟨u,∂ˉφ∗∂ˉu⟩φ=⟨∂ˉu,∂ˉu⟩φ=∥∂ˉu∥φ2 and ⟨∂ˉ∂ˉφ∗u,u⟩φ=⟨∂ˉφ∗u,∂ˉφ∗u⟩φ=∥∂ˉφ∗u∥φ2, while conjugate symmetry [F11] turns the first expression into ⟨∂ˉφ∗∂ˉu,u⟩φ because [F1] makes it a real number; adding the two terms and using the definition of □ from step 1.4 gives the claim.

3.1F1step 1.2step 1.3step 2.1step 2.2algebra

The two summands of ⟨□u,u⟩φ evaluate as ∑j⟨δjDju,u⟩φ=∑j⟨Dju,Dju⟩φ=∑∣J∣=q∑k∫Ω∣DkuJ∣2e−φdV by the adjoint identity of step 1.3, and ∑j,k⟨φjkˉεkιju,u⟩φ=∑j,k⟨εk(φjkˉιju),u⟩φ=∑j,k⟨φjkˉιju,ιku⟩φ=∑j,k∫Ω∑∣J∣=q−1φjkˉujJukJ‾e−φdV by the adjointness of step 1.2, the scalar commutation of εk and the pairing formula [F1]; adding these two evaluations through the decomposition of step 2.1 and combining with step 2.2 proves claim 1.

4.1F8F9step 3.1givenalgebra

If φ is plurisubharmonic, the Levi criterion [F9] applied to the Levi form [F8] gives ∑j,kφjkˉ(a)ξjξk‾≥0 for every a∈Ω and ξ∈Cn, and applying this at each point with the given coefficients ξj:=ujJ(a), for every increasing J of size q−1, exhibits the integrand of the second term in step 3.1 as a sum of nonnegative quantities; the first term of step 3.1 is a sum of squares of absolute values, hence also nonnegative, so dropping it from the identity of claim 1 yields the inequality of claim 2.

5.1F12F13F14step 3.1step 4.1∎

Both claims of the Statement are proved: claim 1 is the identity assembled in step 3.1, and claim 2 follows from it by the nonnegativity established in step 4.1; the ambient hypothesis is the AC recorded in the Statement and cited as [F14], its countable instance is [F13] as supplied through [F12] by the interfaces [F1] and [F6], and no family of nonempty sets is selected anywhere in the argument.

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