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Basic Bochner–Kodaira–Morrey estimate on
Statement
Assume the Axiom of Choice (AC). Let be open with . Use one-based labels for , also for their derivatives and form coefficients. Let , write
let , and let be a compactly supported smooth -form on , with coefficients on increasing tuples extended to non-increasing tuples by antisymmetry, so that when (Weighted L2 spaces and maximal dbar operators); the operators are those of Wirtinger operators in . All sums over multi-indices below run over increasing tuples, and are the inner product and norm of , and is the weighted Hilbert adjoint of (Weighted L2 spaces and maximal dbar operators).
- (Exact Bochner–Kodaira–Morrey form.) The following identity holds, all integrals being finite:
- (Levi inequality.) If in addition is plurisubharmonic on , then
Facts & Assumptions
Given: The Axiom of Choice; an open set with ; a function ; an integer ; a compactly supported smooth -form ; and the notation , , acting coefficientwise, where the Wirtinger operators are those fixed in the Statement, so that the holomorphic derivative, and not , appears in ; further on coefficient tensors, and for increasing .
The weighted inner product and norm on coefficient tuples of bidegree are and (Weighted L2 spaces and maximal dbar operators).
The distributional derivative of is (Weighted L2 spaces and maximal dbar operators).
The weighted adjoint is characterized by for all and (Weighted L2 spaces and maximal dbar operators).
Coefficients are extended to non-increasing tuples by antisymmetry, so that when (Weighted L2 spaces and maximal dbar operators).
The conventions and are in force for and for (Weighted L2 spaces and maximal dbar operators).
For every of bidegree lies in , and (The maximal distributional dbar operator is closed and densely defined).
Wedge multiplication of basis vectors is multilinear and alternating, so and transposing two neighbouring entries changes the sign; it is also associative, and the strictly increasing monomials form a basis; hence for a distinct and an increasing tuple one has , while when (The basic wedge map is multilinear and alternating, Exterior multiplication is well defined, graded, associative, unital, and graded-commutative, Wedge monomials in a dual basis form a basis).
The Levi form is (The Levi form and strict plurisubharmonicity).
A real-valued function is plurisubharmonic if and only if its Levi form is pointwise semidefinite nonnegative (The C^2 Levi criterion for plurisubharmonicity).
For a function with continuous second partial derivatives, (Continuous second partials of a scalar potential commute).
On every measure space the complex pairing is linear in the first variable, conjugate-linear in the second, conjugate symmetric and positive definite (The complex pairing is well-defined and satisfies Cauchy–Schwarz).
The Axiom of Countable Choice supplies a choice function for every at most countable family of nonempty sets (The Axiom of Countable Choice ()).
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 AC 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
The notation of the given block is well defined on coefficient tensors, and for increasing the sign rule [F7] gives for and for , while the antisymmetry convention [F4] gives for and for , where ; consequently the Clifford relation holds, because for one has and , for one has and , for with both terms vanish since an index occurring twice wedges to zero, and for with the terms vanish when and otherwise cancel by the sign identity , whose two exponents differ by exactly one because exactly one of , holds.
For coefficient tensors of degree and of degree with compactly supported smooth coefficients, : by [F11] both sides are sesquilinear in , and on constant basis tensors , the formulas above from [F7] and [F4] give and , which are equal since exactly when ; multiplying the pointwise identity by the positive factor and integrating with the pairing of [F1] gives the weighted statement.
For all one has , and hence also by conjugate symmetry; indeed, is a compactly supported smooth -form and a compactly supported smooth -form lying in with by [F6], while [F2] gives , so the characterizing identity [F3] reads .
On compactly supported smooth forms the operator identities and hold pointwise in the increasing coefficients, the first because [F2] expands as the sum of the wedges , and the second because the coefficient formula of [F6] is on each increasing , which is what produces; consequently the self-adjoint-shaped operator satisfies on those forms.
The operator identity holds on compactly supported smooth forms: by the identities of step 1.4, the constant-coefficient form operators commute with the coefficientwise operators , and by the Clifford relation of step 1.1 one has and , so ; the commutator acting coefficientwise is the multiplication operator , since the coefficientwise derivatives commute and only the term where hits survives, and by clairaut [F10].
The left-hand side of claim 1 equals : since and its images are compactly supported smooth forms lying in the relevant domains, with by the degree convention [F5] when , the characterizing adjoint identity [F3] applied to the pairs and gives and , while conjugate symmetry [F11] turns the first expression into because [F1] makes it a real number; adding the two terms and using the definition of from step 1.4 gives the claim.
The two summands of evaluate as by the adjoint identity of step 1.3, and by the adjointness of step 1.2, the scalar commutation of 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.
If is plurisubharmonic, the Levi criterion [F9] applied to the Levi form [F8] gives for every and , and applying this at each point with the given coefficients , for every increasing of size , 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.
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.
Depends on
- Weighted L2 spaces and maximal dbar operators
- The maximal distributional dbar operator is closed and densely defined
- The basic wedge map $(v_1,\dots,v_k)\mapsto v_1\wedge\cdots\wedge v_k$ is multilinear and alternating
- Exterior multiplication is well defined, graded, associative, unital, and graded-commutative
- Wedge monomials in a dual basis form a basis
- Wirtinger operators in $\mathbb{C}^m$
- The Levi form and strict plurisubharmonicity
- The C^2 Levi criterion for plurisubharmonicity
- Continuous second partials of a scalar potential commute
- The complex $L^2$ pairing is well-defined and satisfies Cauchy–Schwarz
- AC implies DC implies countable choice
- The Axiom of Countable Choice ($\mathrm{AC}_\omega$)
- The Axiom of Choice
Used by
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Dependency tree · two levels
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Sources
- Jean-Pierre Demailly, Complex Analytic and Differential Geometry (standard reference, not scraped)
- Harold P. Boas, Lecture Notes on Several Complex Variables (standard reference, not scraped)
- Mohammad Jabbari, Several Complex Variables course notes (standard reference, not scraped)