Exact bridge from the two within-half terminal carriers to the nested cross carrier #
After the left and right canonical within-half suffixes have both been
processed, their surviving coordinates are precisely the two copies of
finalActive. Paper §4.2 Step 3 starts from the union of those two copies.
This file proves that identification as an actual coordinate equivalence and
lifts it to a measure-preserving reindexing of product Haar measure.
The physical core below uses the genuine terminal within-half residual integrands and the genuine marker-preserving covariance product. Thus the integral bridge does not pass through a separately postulated, target-shaped density.
A completed within-half prefix has exactly the paper's terminal active carrier.
The initial nested schedule carries exactly all variables left by the two within-half reductions.
Completed two-half data #
The proof-relevant endpoint of both literal within-half schedules.
- left : R324WithinHalfResidualPrefix ρ lam ε κp
- right : R324WithinHalfResidualPrefix ρ lam ε κm
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Coordinates of the literal initial nested cross prefix.
Equations
- _terminal.NestedCoordinate π = ↥(Anderson4D.R324NestedCrossResidualPrefix.initial κp κm π).activeCarrier
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Equations
- terminal.nestedCoordinateFintype π = inferInstance
The two terminal within-half carriers, with their ambient labels preserved, map canonically into the initial nested cross carrier.
Equations
- terminal.survivingSumToNested π (Sum.inl i) = ⟨Anderson4D.leftMomentIndex ↑i, ⋯⟩
- terminal.survivingSumToNested π (Sum.inr j) = ⟨Anderson4D.rightMomentIndex ↑j, ⋯⟩
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The two terminal within-half carriers, with their ambient labels preserved, are exactly the initial nested cross carrier.
Equations
- terminal.survivingSumEquivNested π = Equiv.ofBijective (terminal.survivingSumToNested π) ⋯
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Product terminal coordinates reindexed as the literal initial nested coordinate tuple.
Equations
- One or more equations did not get rendered due to their size.
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The exact product-Haar measure is preserved by the two-half to nested coordinate reindexing.
Genuine terminal and nested physical cores #
Assemble the two genuine terminal within-half reconstructions into the doubled ambient carrier. This definition is independent of the nested schedule.
Equations
- terminal.terminalDoubledReconstruct p k = match (Anderson4D.momentDoubleFinEquiv m).symm k with | Sum.inl i => terminal.left.reconstruct p.1 i | Sum.inr j => terminal.right.reconstruct p.2 j
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Reconstruct the doubled ambient tuple from the literal initial nested carrier, setting only genuinely absent coordinates to zero.
Equations
- terminal.nestedReconstruct π v k = if hk : k ∈ (Anderson4D.R324NestedCrossResidualPrefix.initial κp κm π).activeCarrier then v ⟨k, hk⟩ else 0
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The abstract measure reindexing reconstructs exactly the same ambient doubled tuple as the two concrete terminal within-half reconstructions.
At an actually completed suffix, no unprocessed difference or primitive factor remains hidden in the within-half residual integrand.
Right-copy counterpart of left_residualIntegrand_eq_chain.
Genuine post-phase-A physical fibre on the product of the two completed within-half carriers. The projected marker remains inside the complete physical covariance product.
Equations
- One or more equations did not get rendered due to their size.
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The same genuine physical fibre, now expressed on the literal initial
nested carrier. This is a lossless coordinate transport of
terminalMarkedPhysicalCore, not an independently postulated model
integrand.
Equations
- terminal.initialNestedMarkedPhysicalCore π selected L x y z w v = terminal.terminalMarkedPhysicalCore π selected L x y z w ((terminal.terminalProductPiMeasurableEquivNested π).symm v)
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In particular, the genuine marker-preserving covariance product is unchanged by the terminal-to-nested coordinate bridge.
Pointwise losslessness of the physical terminal-to-nested transport.
Exact two-half-to-nested Fubini bridge.
The integral of the actual completed two-half physical fibre is exactly
the integral of that same fibre on
R324NestedCrossResidualPrefix.initial. No norm, estimate, or enlarged
density is introduced.
Weighted within-half transition #
The scalar residual-value iteration from the earlier module is insufficient under a cross covariance, because that covariance depends on the coordinates which survive the current half. The following theorem is the required outer-functional strengthening: the outer function may depend arbitrarily on every post-head coordinate, but is fixed during the current local block integral.
One exact head transition with a genuinely coordinate-dependent complex outer factor. Its pullback to the pre-head carrier is the second component of the proved measure-preserving head/post split.
A data-valued version of the exact within-half ready trace.
The earlier trace intentionally lives in Prop, so Lean correctly forbids
eliminating it to obtain the terminal coordinate type. This Type-valued
trace stores the same genuine step certificates and can therefore carry a
coordinate-dependent outer function all the way to its actual terminal
carrier.
- terminal {ρ : SmoothCutoff} {lam ε : ℝ} {m : ℕ} {pairing : PartialPairing (Fin m)} {x y : T4} (res : R324WithinHalfResidualPrefix ρ lam ε pairing) (hremaining : res.remaining = []) : R324WithinHalfWeightedTrace x y res
- step {ρ : SmoothCutoff} {lam ε : ℝ} {m : ℕ} {pairing : PartialPairing (Fin m)} {x y : T4} (res : R324WithinHalfResidualPrefix ρ lam ε pairing) (head : R322ExtractionStep m) (tail : List (R322ExtractionStep m)) (hremaining : res.remaining = head :: tail) (ready : res.R324WithinHalfResidualStepReady head tail hremaining x y) (next : R324WithinHalfWeightedTrace x y (res.afterHead head tail hremaining)) : R324WithinHalfWeightedTrace x y res
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The literal terminal prefix reached by a data-valued trace.
Equations
- (Anderson4D.R324WithinHalfWeightedTrace.terminal res hremaining).terminalPrefix = res
- (Anderson4D.R324WithinHalfWeightedTrace.step res head tail hremaining ready next).terminalPrefix = next.terminalPrefix
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Restrict a current surviving tuple through every proved head/post split until it becomes a tuple on the actual terminal carrier.
Equations
- One or more equations did not get rendered due to their size.
- (Anderson4D.R324WithinHalfWeightedTrace.terminal res hremaining).terminalProjection = fun (v : res.SurvivingCoordinate → Anderson4D.T4) => v
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Weighted integrability required exactly at the nonterminal nodes.
Equations
- One or more equations did not get rendered due to their size.
- (Anderson4D.R324WithinHalfWeightedTrace.terminal res hremaining).WeightedIntegrableAlong outer_2 = True
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The terminal prefix has an empty suffix.
The terminal prefix has processed the complete analytic schedule.
Exact weighted iteration through the full literal suffix.
A uniform genuine step provider constructs the data-valued trace needed for coordinate-dependent outer factors.
Equations
- One or more equations did not get rendered due to their size.
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Package the actual terminal prefixes of two data-valued within-half traces for the carrier/Fubini bridge above.
Equations
- One or more equations did not get rendered due to their size.
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The genuine marked cross covariance, evaluated on the two actual terminal projections of a pair of weighted traces.
Equations
- One or more equations did not get rendered due to their size.
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Exact two-sided weighted within-half iteration.
The left trace is collapsed with the right terminal projection fixed, then the right trace is collapsed with the completed left integral as its outer factor. The theorem stays in physical space and takes no norm.
Fubini identifies the iterated terminal expression with the genuine
product-carrier terminalMarkedPhysicalCore.
Full exact bridge: two physical within-half traces to the literal initial nested cross prefix.
Only integrability facts are assumed. The equality itself is derived from the genuine local collapse identities, Fubini, and the proved measure-preserving carrier equivalence.