Quantitative closure of the L² parametrix step #
This file completes the probability and finite-sum part of P-L2 without
postulating an operator realization. The canonical operators constructed
from the Fourier coefficients are strongly measurable almost everywhere.
Their finite sum Q_A satisfies the elementary but indispensable estimate
E ‖Q_A‖² ≤ (A + 1) * ∑_{m=0}^A E ‖P_m‖².
The last section combines this estimate with an honest almost-everywhere P-err input. The validity of the two operator identities is included in the good event; it is not silently strengthened to a pointwise hypothesis.
Measurability of the canonical coefficient operators #
The canonical order operator is almost everywhere strongly measurable.
The target operator space is not assumed separable. We therefore do not
appeal to Borel measurability of an arbitrary operator-valued tsum.
Instead, finite Fourier sums are strongly measurable and converge in
operator norm almost surely by the square-summability theorem.
Explicit second-moment budgets #
The explicit right side of the orderwise (3.31) estimate.
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The canonical order operator has an integrable squared norm.
Real expectation form of the canonical orderwise (3.31) bound.
The physical truncation: deterministic order zero #
One piece of the physical truncation. The zeroth piece is the bounded Green multiplier itself. Positive pieces use the canonical square-summable coefficient construction.
This distinction is forced in dimension four: G is bounded but not
Hilbert--Schmidt, so its Fourier matrix must not be fed to
squareSummableFourierOperator.
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- Anderson4D.canonicalPhysicalParametrixL2Piece M ρ lam ε i = if ↑i = 0 then fun (x : M.Ω) => Anderson4D.greenL2Op else Anderson4D.canonicalParametrixOrderL2Operator M ρ lam ε ↑i
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The actual finite physical parametrix
P_ε = G + ∑_{m=1}^A P_m.
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- Anderson4D.canonicalPhysicalTruncatedParametrixL2Operator M ρ lam ε A ω = ∑ i : Fin (A + 1), Anderson4D.canonicalPhysicalParametrixL2Piece M ρ lam ε i ω
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The orderwise budget, with the deterministic Green piece bounded by one.
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The finite physical budget. The factor A + 1 is exactly the
cardinality in ‖Σ A_m‖² ≤ (A+1) Σ ‖A_m‖².
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A mixed second/first-moment good event #
Second-moment Markov at an arbitrary positive operator-norm threshold.
The paper-scale event, augmented by an explicit validity predicate for the operator identities and the physical/factorized bridge.
Keeping valid inside the event permits the identities to hold only
almost surely, as is natural for random kernels.
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Mixed Chebyshev/Markov estimate: the parametrix uses its proved second moment, while P-err supplies the paper's first-moment remainder estimate. An almost-sure identity/bridge input costs zero measure.
The exact remaining P-err/operator bridge #
The almost-sure predicate still required from P-err and the
physical-kernel/operator bridge. It says both that the factorized
parametrix identities hold and that multiplying the factorized
parametrix by G gives the canonical physical operator constructed
from the coefficients.
This is a definition of the unresolved input, not an output predicate: none of its fields contains a norm estimate or a desired conclusion.
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The canonical paper-scale event. Its norm threshold is imposed on
the physical parametrix P_ε = Qfactor * G, not on the auxiliary
factorized operator.
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Fully instantiated probability bound for the canonical finite parametrix. The only unclosed hypotheses are exactly P-3.5b/Fubini, P-wick, P-3.5b-det, and the P-err/physical-operator bridge plus its first-moment remainder estimate.
If the finite-sum budget and the two remainders have the powers
used in paper (3.32), the exceptional set is at most 2 ε².
The explicit factor two records the union bound.
Inversion using the left correction #
Left-corrected version of the inverse formula. This orientation is
the one whose error is controlled by the norm of the physical
parametrix Q * G.
Quantitative left-corrected error, depending on ‖QG‖ rather than
the auxiliary factorized norm ‖Q‖.
Pointwise canonical inversion on the good event #
Paper (3.33), now attached to the canonical coefficient operator and requiring P-err only through the validity conjunct of the event.