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The Ignorant Observer inside Everett

Aernoud Dekker

Published Jul 4, 2026• 0 citations
Publisher

Abstract

The Ignorant Observer Framework stated as a finite-record quotient theory hosted by a no-collapse interpretation, developed for the Everettian host. Four results carry the structure: a record-quotient theorem (decoherence realizes the modulus map; Fisher-Rao geometry is the host's projective metric restricted to the record base), a phase-limit theorem (relative phase stays host-side), an exact Breuer-type reference-closure obstruction with the data-rate inequality, and an emergent-reference-rate theorem fixing h_KS as an einselected semiclassical quantity. Version 2 closes the probability residuals at the record boundary: the accessible record algebra as a proposition conditional on spectrum-broadcast structure; existence of a probability measure relocated to bookkeeping coherence with branch counting excluded; the fixed-context Born form for every outcome number; and self-locating credence identified with the Born weights under a named record-credence principle. The Deutsch-Wallace burden is narrowed and the Dawid-Friederich critique answered in a structured remark. Companion papers: The Ignorant Observer (DOI 10.17605/OSF.IO/FCDSN), The Born Rule from Finite Observation (10.17605/OSF.IO/U5RDE), Why Fisher Geometry Gives Binary Born but Not Quantum Phase (10.17605/OSF.IO/N3SU9), Bandwidth-Limited Quantum Control (10.17605/OSF.IO/G5WRH).

DOI
10.17605/osf.io/ghjbq

Related papers

Why Fisher Geometry Gives Binary Born but Not Quantum Phase

Aernoud Dekker

Why Fisher Geometry Gives Binary Born but Not Quantum Phase is the limitative companion to the conditional Born-rule derivation (osf.io/u5rde) within the Ignorant Observer Framework (IOF). The Born paper shows that finite-record Fisher–Rao geometry, together with two stated bridge assumptions, reconstructs the binary single-system Born weight p(θ) = cos²(θ/2). This paper proves the matching negative result: the same Markov-invariant, finite-record geometry that fixes that weight generates no quantum phase. The Fisher–Rao metric is real and phase-blind — nothing in finite-observer record geometry singles out the complex phase, or the relative phases that distinguish genuine quantum interference from a classical mixture. Two consequences follow. First, the reconstruction is honestly bounded: the binary Born weight is the Born structure native to a finite observer, while multi-outcome amplitudes, complex phase, and the full Hilbert-space formalism are hosted by the embedding rather than derived. Second, this limit is a feature, not a gap — it marks exactly where the finite-observer account stops and the ambient quantum formalism must be assumed, keeping the derivation's scope explicit. Part of the Ignorant Observer Framework (IOF): framework parent at osf.io/fcdsn, conditional Born-rule derivation at osf.io/u5rde.

•Jan 1, 2026•0 citations

The Born Rule from Finite Observation

Aernoud Dekker

A conditional derivation of the binary Born probability form p(θ) = cos²(θ/2) in the physical basis coordinate θ of a Bandwidth-Limited Quantum Control (BLQC) experiment, within the Ignorant Observer Framework (IOF). The derivation rests on two load-bearing bridge assumptions: that BLQC effective tracking capacity C_eff is capacity for preserving operational distinguishability of finite observer records (the Fisher capacity bridge), and that the scalar BLQC threshold κ = h_KS − C_eff ln 2 is homogeneous in the physical basis coordinate (scalar-threshold homogeneity). Under the Fisher capacity bridge plus standard finite-resolution invariance, Cencov's theorem selects Fisher–Rao as the unique distinguishability metric on observer records; the binary record then carries the Fisher-arclength identity p(s) = cos²(s/2) by elementary geometry. Scalar-threshold homogeneity forces equal increments of θ to carry equal Fisher cost, so the Fisher arclength coordinate is affine in the physical basis coordinate; endpoint calibrations p(0) = 1 and p(π) = 0 then fix p(θ) = cos²(θ/2). The result is conditional on both bridge assumptions. Neither the bridge nor the full Hilbert-space formalism of quantum mechanics is derived here. The paper supersedes an earlier conditional derivation that obtained the binary Born form only in Fisher arclength and deferred the identification of that arclength with the laboratory basis angle; the BLQC bridge here is that deferred step, folded back into the original derivation as a single coherent argument. Part of the Ignorant Observer Framework (IOF): framework parent at osf.io/fcdsn, BLQC technical core at osf.io/g5wrh.

•Jan 1, 2026•0 citations

Where Did the Measurement Basis Come From?

Aernoud Dekker

Companion document to Bandwidth-Limited Quantum Control (BLQC) within the Ignorant Observer Framework (IOF). It states the conceptual claim that BLQC's experimental discriminator operationalizes: that the measurement basis is not an externally supplied free parameter but a physical variable with causal ancestry inside the same history as the measured system. The ontology is explicitly hosted: a no-collapse embedding (pilot-wave or Everett-type) supplies the Born weights and the standard quantum correlations, and IOF contributes only a single capacity-dependent visibility attenuation on top. The Born rule and Bell's theorem are not derived; the falsifiable handle is the BLQC capacity-instability scaling. The position on Bell is measurement dependence in the technical, non-conspiratorial sense defended by Palmer, distinguished from a completed deterministic theory of the 't Hooft type. Three standard objections are addressed in order: that the move merely relocates the mystery, that the predicted visibility loss is just correctable reference noise, and that the framework reduces measurement to control engineering. The paper relocates the Heisenberg cut from interpretive convention to an operational boundary set by the apparatus's finite basis-tracking budget, with the Landauer bound entering only as a thermodynamic ceiling, not as the operative rate. Part of the Ignorant Observer Framework (IOF): framework parent at osf.io/fcdsn, BLQC technical core at osf.io/g5wrh.

•Jan 1, 2026•0 citations

The Ignorant Observer

Aernoud Dekker

The Ignorant Observer Framework (IOF) is a control-theoretic interpretation of quantum measurement. It treats the observer as a physical dynamical system with finite effective capacity C_eff and a nonzero internal instability rate h_KS, and the measurement basis as a physical reference variable the observer must keep tracking. The Data-Rate Theorem then sets a deficit rate κ = h_KS − C_eff ln 2, with two regimes. For κ < 0 (capacity-wins) the observer keeps its basis resolved and textbook fixed-basis quantum mechanics is operationally available. For κ > 0 (chaos-wins) standard quantum mechanics still holds, but the observer's reference frame is unresolved, so its raw, unconditioned records lose contrast by ordinary phase averaging, V_obs = V_std · exp(−σ²/2). Unitary dynamics are untouched and no physical collapse is postulated; apparent collapse is an observer-level loss of trackability, and the lost contrast returns when the missing reference information is supplied. Because the loss is recoverable, IOF is presented for what it is — an interpretation, not a rival theory — and it makes no empirical prediction beyond standard quantum mechanics. A stronger reading of the visibility law (a capacity-dependent, unrecoverable loss beyond standard decoherence) would have made IOF empirically distinct; that reading is stated precisely and is excluded by existing experiments (logged-setting Bell tests, randomized-measurement tomography, correlation spectroscopy). What remains has three layers kept in separate books: the interpretation; a conditional foundations result (the binary single-system Born weight reconstructed from finite-record Fisher–Rao geometry); and an operational control law. The control law's one live experimental use is to calibrate a discriminating test of Penrose objective reduction — a test of gravity-side collapse against standard physics, not of IOF against quantum mechanics.

•Nov 14, 2025•1 citation

Bandwidth-Limited Quantum Control

Aernoud Dekker

Bandwidth-Limited Quantum Control (BLQC) is the operational tier of the Ignorant Observer Framework (IOF): a finite-rate phase-reference control law and its benchmark. The object of study is not a modification of the Schrödinger equation, a derivation of the Born rule, or a solution to Bell's theorem. It is a narrower control question: if the phase or basis reference θ(t) is maintained by a finite-rate tracking loop, does the observer-relative loss of online visibility scale with the deficit between the reference dynamics and the tracking channel? In a minimal phase-reference model, an unstable reference mode with instability rate h_KS tracked through an effective channel of rate C_eff predicts V(t) = exp[−(1/2) σ₀² e^(2κt)], with κ = h_KS − C_eff ln 2. The primary observable is the breakdown time t_break ∝ 1/(h_KS − C_eff ln 2) under deliberate throttling of the effective basis-tracking channel. Crucially this is reference-frame physics within standard quantum mechanics: standard quantum mechanics plus the classical Data-Rate Theorem already predict it, and the lost contrast is recoverable once the missing reference information is supplied. The benchmark is therefore expected — it calibrates the reference channel rather than discriminating IOF from quantum mechanics. A residual, capacity-scaled loss below the shadow-log prediction would be the one reading that is new physics; it is excluded by existing recoverability experiments and survives only as a registered test for certified deterministic-chaotic reference dynamics, with the prior strongly against it. The mesoscopic regime is the scientific target because the same finite-rate timescale can overlap with Penrose objective-reduction timescales while depending on different knobs — tracking bandwidth rather than mass geometry. The calibrated reference channel and the recoverability classifier defined here are what the companion Experimental Protocol uses to discriminate Penrose objective reduction from standard physics. We specify the assumptions, operational estimators, calibration rules, and decision rules. Companion documents: framework parent at osf.io/fcdsn, experimental protocol at osf.io/2qjne, retrospective forensic analysis at osf.io/m5tb9.

•Jan 1, 2025•0 citations

Admissible Record Construction in Physically Non-Selective Quantum Regimes

Amos Maley

A Kernel-Role Determinacy Theorem for Record Fixation, Fixed-Domain Quotients, and Boundary-Trace Normal Form This paper specializes the AASC kernel to the construction and use of quantum measurement records. Its central question is not initially how outcomes are produced, whether a wavefunction collapses, or which interpretation of quantum theory is correct. It asks what must be fixed for a measurement record to function as the same determinate physical and evidential object across retention, prospective use, deliberation, comparison, and report. For any non-degenerate determinate physical object, state, carrier, transformation, record, comparison, or endpoint, the paper takes the governing kernel to be: NDObj(x) ⇒ K(x) = (Adm, Stand, Ref, Irr). Admissibility, standing, reference, and irreversibility are therefore treated as necessary role conditions of determinate record use, not as an optional interpretive overlay added to an otherwise complete physical description. Measurement-record determinacy The manuscript constructs a fixed-domain measurement-record target in which a record must preserve: reference to the same construction token; standing-bearing evidential eligibility; admissible reuse; original act-time qualification; lawful redescription; retained and prospective record use; deliberative and comparative use; reportability and downstream inheritance. The resulting assignment space is quotiented by equivalence of standing-bearing measurement-record content. A rival quotient claiming exactly the same content collapses to the canonical measurement-record quotient. Representational differences that preserve the complete role content are treated as skin; differences affecting record identity, evidential ordering, admissibility, continuation, or downstream use remain physically relevant. Physically non-selective quantum regimes The paper then studies a physically non-selective quantum regime containing unitary branching, entanglement, decoherence, branch-local records, and stable local reports. The central result is conditional and target-specific: The bare unitary-entangling-decohering package can support multiple stable branch-local records without supplying a unique standing evidential record for the fixed construction-relative target. This is not a claim that branch-local records are unreal, unstable, or physically useless. It is a distinction between: physical occurrence of branch-local record structures; local branch-relative reportability; evidential role fixation for a record reused as the same standing object across the measurement practice. The paper shows that non-selective structures may agree on branch weights, density content, decoherence, correlations, instrument sums, channel closure, effect weights, projector orthogonality, and repeatability without selecting one fine record as the standing evidential record. Fixed-domain quotient and fixation commutation The theorem ladder establishes: fixed-domain assignment-space forcing; exact quotient construction for standing-bearing record content; same-scope equivalence collapse; fixation commutation under admissible transformation; inheritance of the original qualification requirement; persistence-bearing reuse; asymmetry exhaustion; anti-weakening; selector exhaustion. If evidential ordering varies across admissible assignments while the target requires one fixed-domain ordering, the ordering is not defined on that scope merely because numerical values or branch-local reports happen to coincide. The paper therefore treats measurement-record fixation as prior to the theory-level evidential reuse that depends on it. Boundary-trace normal form After internal and provenance/indexical routes have been exhausted, the residual same-domain route is a singleton stable boundary trace. Such a trace is not collapse dynamics, hidden-variable selection, or a new physical mechanism. It is an admissibility-preserving role anchor that can fix a record-bearing assignment only when its channel, incidence, transport law, original authority, and singleton-positive condition are independently warranted. The result distinguishes: sound partial selection from complete role fixation; unique trace value from unique original occupant; class-valued record fixation from raw-token fixation; later discovery of an original qualification from retroactive repair; physical record occurrence from standing evidential identity. Finite quantum specialization The paper occupies the abstract structure with an explicit finite two-branch quantum measurement domain containing: two outcomes; two fine records and one merged record; denominator-two branch weights; a balanced integer-amplitude state; density-table realization; selective and non-selective instrument maps; environment-record maps; projective branch maps; complementary effects; zero-product projectors; repeatability operations. On the declared balanced witness, amplitude weights, density weights, branch-map traces, effect weights, pointer records, instrument records, environment records, and channel records agree on the same branch architecture. Selective surfaces preserve the fine-record distinction. Non-selective surfaces agree only on the merged record. The fine records therefore remain separated, while the declared non-selective surfaces supply no singleton fine-record selector. The finite selector-boundary theorem eliminates the disjunction of candidate hidden selectors across the state, instrument, environment, channel, effect, and repeatability surfaces. The resulting diagnosis is precise: the missing structure is admissible fine-record role fixation, not further branch production, weighting, decoherence, stabilization, or repeatability. Scope and non-claims The manuscript establishes a finite, conditional, manuscript-facing theorem. It does not claim: to derive Hilbert-space quantum mechanics; to derive general POVM theory; to derive full projection-valued-measure theory; to reconstruct the full operator algebra; to provide a general Kraus representation theorem; to reconstruct complete positivity; to derive the continuum Born rule; to derive universal physical decoherence theory; to introduce a new collapse dynamics; to prove that no physical collapse process occurs in nature; to prove physical branch selection; to establish interpretive truth; to classify every possible physical measurement mechanism. The absence of a hidden selector on the declared finite non-selective surfaces is therefore not a theorem that no physical collapse or selection process can occur elsewhere. It is the finite theorem that those declared surfaces do not themselves supply the required fine-record selector. Relation to quantum interpretations The result does not deny the practical success of quantum theory, decoherence, branch-relative reporting, instrumental updates, or decision-theoretic methods. A practice aimed only at prediction, branch-local reporting, or instrumental updating may be a different target from the construction-relative record use studied here. If a theory claims to underwrite retained, prospective, deliberative, and evidential reuse of the same record-bearing construction token, it must preserve the relevant kernel roles and admit a standing-bearing fixation regime. Bare Everettian dynamics, without additional dynamics, ontological privileging, or admissible restriction to one constructional class, supplies no fine-record selector on the declared target. A strategy that preserves non-selective physics while restricting admissible record-fixation assignments belongs to a restriction-to-one-constructional-class route. Instrumentalist and QBist strategies instead reduce or redirect the target explanatory burden. Role in the AASC programme This paper provides the record-fixation layer of the AASC Quantum Determinacy Pair. Its companion Bell-scope work addresses the compatibility and no-signaling side of quantum witness determinacy. Together, the pair treats quantum records and witnesses as kernel-governed standing structures rather than as automatically determinate physical occurrences. The paper’s principal contribution is to identify the first failure point in a physically non-selective measurement regime: The initial problem is not necessarily the production of branch-local outcomes. It is the admissible fixation of the record role through which outcomes are retained, reported, remembered, compared, and used as evidence. The public Lean 4 formalization is synchronized with the finite measurement-boundary release v0.9.1 and provides the finite artifact for the declared effect, projector, compatibility, closed-stack, boundary-certificate, and audit layers. Keywords AASC; measurement problem; quantum measurement; measurement-record fixation; physically non-selective regimes; Everettian non-selection; record-role determinacy; fixed-domain quotient; standing equivalence; boundary-trace fixation; selector exhaustion; decoherence; branch-local records; admissibility and irreversibility; Lean 4 formalization

•Feb 7, 2026•0 citations
The Ignorant Observer Framework stated as a finite-record quotient theory hosted by a no-collapse interpretation, developed for the Everettian host. Four results carry the structure: a record-quotient theorem (decoherence realizes the modulus map; Fisher-Rao geometry is the host's projective metric restricted to the record base), a phase-limit theorem (relative phase stays host-side), an exact Breuer-type reference-closure obstruction with the data-rate inequality, and an emergent-reference-rate theorem fixing h_KS as an einselected semiclassical quantity. Version 2 closes the probability residuals at the record boundary: the accessible record algebra as a proposition conditional on spectrum-broadcast structure; existence of a probability measure relocated to bookkeeping coherence with branch counting excluded; the fixed-context Born form for every outcome number; and self-locating credence identified with the Born weights under a named record-credence principle. The Deutsch-Wallace burden is narrowed and the Dawid-Friederich critique answered in a structured remark. Companion papers: The Ignorant Observer (DOI 10.17605/OSF.IO/FCDSN), The Born Rule from Finite Observation (10.17605/OSF.IO/U5RDE), Why Fisher Geometry Gives Binary Born but Not Quantum Phase (10.17605/OSF.IO/N3SU9), Bandwidth-Limited Quantum Control (10.17605/OSF.IO/G5WRH).
Why Fisher Geometry Gives Binary Born but Not Quantum Phase is the limitative companion to the conditional Born-rule derivation (osf.io/u5rde) within the Ignorant Observer Framework (IOF). The Born paper shows that finite-record Fisher–Rao geometry, together with two stated bridge assumptions, reconstructs the binary single-system Born weight p(θ) = cos²(θ/2). This paper proves the matching negative result: the same Markov-invariant, finite-record geometry that fixes that weight generates no quantum phase. The Fisher–Rao metric is real and phase-blind — nothing in finite-observer record geometry singles out the complex phase, or the relative phases that distinguish genuine quantum interference from a classical mixture. Two consequences follow. First, the reconstruction is honestly bounded: the binary Born weight is the Born structure native to a finite observer, while multi-outcome amplitudes, complex phase, and the full Hilbert-space formalism are hosted by the embedding rather than derived. Second, this limit is a feature, not a gap — it marks exactly where the finite-observer account stops and the ambient quantum formalism must be assumed, keeping the derivation's scope explicit. Part of the Ignorant Observer Framework (IOF): framework parent at osf.io/fcdsn, conditional Born-rule derivation at osf.io/u5rde.
A conditional derivation of the binary Born probability form p(θ) = cos²(θ/2) in the physical basis coordinate θ of a Bandwidth-Limited Quantum Control (BLQC) experiment, within the Ignorant Observer Framework (IOF). The derivation rests on two load-bearing bridge assumptions: that BLQC effective tracking capacity C_eff is capacity for preserving operational distinguishability of finite observer records (the Fisher capacity bridge), and that the scalar BLQC threshold κ = h_KS − C_eff ln 2 is homogeneous in the physical basis coordinate (scalar-threshold homogeneity). Under the Fisher capacity bridge plus standard finite-resolution invariance, Cencov's theorem selects Fisher–Rao as the unique distinguishability metric on observer records; the binary record then carries the Fisher-arclength identity p(s) = cos²(s/2) by elementary geometry. Scalar-threshold homogeneity forces equal increments of θ to carry equal Fisher cost, so the Fisher arclength coordinate is affine in the physical basis coordinate; endpoint calibrations p(0) = 1 and p(π) = 0 then fix p(θ) = cos²(θ/2). The result is conditional on both bridge assumptions. Neither the bridge nor the full Hilbert-space formalism of quantum mechanics is derived here. The paper supersedes an earlier conditional derivation that obtained the binary Born form only in Fisher arclength and deferred the identification of that arclength with the laboratory basis angle; the BLQC bridge here is that deferred step, folded back into the original derivation as a single coherent argument. Part of the Ignorant Observer Framework (IOF): framework parent at osf.io/fcdsn, BLQC technical core at osf.io/g5wrh.
Companion document to Bandwidth-Limited Quantum Control (BLQC) within the Ignorant Observer Framework (IOF). It states the conceptual claim that BLQC's experimental discriminator operationalizes: that the measurement basis is not an externally supplied free parameter but a physical variable with causal ancestry inside the same history as the measured system. The ontology is explicitly hosted: a no-collapse embedding (pilot-wave or Everett-type) supplies the Born weights and the standard quantum correlations, and IOF contributes only a single capacity-dependent visibility attenuation on top. The Born rule and Bell's theorem are not derived; the falsifiable handle is the BLQC capacity-instability scaling. The position on Bell is measurement dependence in the technical, non-conspiratorial sense defended by Palmer, distinguished from a completed deterministic theory of the 't Hooft type. Three standard objections are addressed in order: that the move merely relocates the mystery, that the predicted visibility loss is just correctable reference noise, and that the framework reduces measurement to control engineering. The paper relocates the Heisenberg cut from interpretive convention to an operational boundary set by the apparatus's finite basis-tracking budget, with the Landauer bound entering only as a thermodynamic ceiling, not as the operative rate. Part of the Ignorant Observer Framework (IOF): framework parent at osf.io/fcdsn, BLQC technical core at osf.io/g5wrh.
The Ignorant Observer Framework (IOF) is a control-theoretic interpretation of quantum measurement. It treats the observer as a physical dynamical system with finite effective capacity C_eff and a nonzero internal instability rate h_KS, and the measurement basis as a physical reference variable the observer must keep tracking. The Data-Rate Theorem then sets a deficit rate κ = h_KS − C_eff ln 2, with two regimes. For κ < 0 (capacity-wins) the observer keeps its basis resolved and textbook fixed-basis quantum mechanics is operationally available. For κ > 0 (chaos-wins) standard quantum mechanics still holds, but the observer's reference frame is unresolved, so its raw, unconditioned records lose contrast by ordinary phase averaging, V_obs = V_std · exp(−σ²/2). Unitary dynamics are untouched and no physical collapse is postulated; apparent collapse is an observer-level loss of trackability, and the lost contrast returns when the missing reference information is supplied. Because the loss is recoverable, IOF is presented for what it is — an interpretation, not a rival theory — and it makes no empirical prediction beyond standard quantum mechanics. A stronger reading of the visibility law (a capacity-dependent, unrecoverable loss beyond standard decoherence) would have made IOF empirically distinct; that reading is stated precisely and is excluded by existing experiments (logged-setting Bell tests, randomized-measurement tomography, correlation spectroscopy). What remains has three layers kept in separate books: the interpretation; a conditional foundations result (the binary single-system Born weight reconstructed from finite-record Fisher–Rao geometry); and an operational control law. The control law's one live experimental use is to calibrate a discriminating test of Penrose objective reduction — a test of gravity-side collapse against standard physics, not of IOF against quantum mechanics.
Bandwidth-Limited Quantum Control (BLQC) is the operational tier of the Ignorant Observer Framework (IOF): a finite-rate phase-reference control law and its benchmark. The object of study is not a modification of the Schrödinger equation, a derivation of the Born rule, or a solution to Bell's theorem. It is a narrower control question: if the phase or basis reference θ(t) is maintained by a finite-rate tracking loop, does the observer-relative loss of online visibility scale with the deficit between the reference dynamics and the tracking channel? In a minimal phase-reference model, an unstable reference mode with instability rate h_KS tracked through an effective channel of rate C_eff predicts V(t) = exp[−(1/2) σ₀² e^(2κt)], with κ = h_KS − C_eff ln 2. The primary observable is the breakdown time t_break ∝ 1/(h_KS − C_eff ln 2) under deliberate throttling of the effective basis-tracking channel. Crucially this is reference-frame physics within standard quantum mechanics: standard quantum mechanics plus the classical Data-Rate Theorem already predict it, and the lost contrast is recoverable once the missing reference information is supplied. The benchmark is therefore expected — it calibrates the reference channel rather than discriminating IOF from quantum mechanics. A residual, capacity-scaled loss below the shadow-log prediction would be the one reading that is new physics; it is excluded by existing recoverability experiments and survives only as a registered test for certified deterministic-chaotic reference dynamics, with the prior strongly against it. The mesoscopic regime is the scientific target because the same finite-rate timescale can overlap with Penrose objective-reduction timescales while depending on different knobs — tracking bandwidth rather than mass geometry. The calibrated reference channel and the recoverability classifier defined here are what the companion Experimental Protocol uses to discriminate Penrose objective reduction from standard physics. We specify the assumptions, operational estimators, calibration rules, and decision rules. Companion documents: framework parent at osf.io/fcdsn, experimental protocol at osf.io/2qjne, retrospective forensic analysis at osf.io/m5tb9.
A Kernel-Role Determinacy Theorem for Record Fixation, Fixed-Domain Quotients, and Boundary-Trace Normal Form This paper specializes the AASC kernel to the construction and use of quantum measurement records. Its central question is not initially how outcomes are produced, whether a wavefunction collapses, or which interpretation of quantum theory is correct. It asks what must be fixed for a measurement record to function as the same determinate physical and evidential object across retention, prospective use, deliberation, comparison, and report. For any non-degenerate determinate physical object, state, carrier, transformation, record, comparison, or endpoint, the paper takes the governing kernel to be: NDObj(x) ⇒ K(x) = (Adm, Stand, Ref, Irr). Admissibility, standing, reference, and irreversibility are therefore treated as necessary role conditions of determinate record use, not as an optional interpretive overlay added to an otherwise complete physical description. Measurement-record determinacy The manuscript constructs a fixed-domain measurement-record target in which a record must preserve: reference to the same construction token; standing-bearing evidential eligibility; admissible reuse; original act-time qualification; lawful redescription; retained and prospective record use; deliberative and comparative use; reportability and downstream inheritance. The resulting assignment space is quotiented by equivalence of standing-bearing measurement-record content. A rival quotient claiming exactly the same content collapses to the canonical measurement-record quotient. Representational differences that preserve the complete role content are treated as skin; differences affecting record identity, evidential ordering, admissibility, continuation, or downstream use remain physically relevant. Physically non-selective quantum regimes The paper then studies a physically non-selective quantum regime containing unitary branching, entanglement, decoherence, branch-local records, and stable local reports. The central result is conditional and target-specific: The bare unitary-entangling-decohering package can support multiple stable branch-local records without supplying a unique standing evidential record for the fixed construction-relative target. This is not a claim that branch-local records are unreal, unstable, or physically useless. It is a distinction between: physical occurrence of branch-local record structures; local branch-relative reportability; evidential role fixation for a record reused as the same standing object across the measurement practice. The paper shows that non-selective structures may agree on branch weights, density content, decoherence, correlations, instrument sums, channel closure, effect weights, projector orthogonality, and repeatability without selecting one fine record as the standing evidential record. Fixed-domain quotient and fixation commutation The theorem ladder establishes: fixed-domain assignment-space forcing; exact quotient construction for standing-bearing record content; same-scope equivalence collapse; fixation commutation under admissible transformation; inheritance of the original qualification requirement; persistence-bearing reuse; asymmetry exhaustion; anti-weakening; selector exhaustion. If evidential ordering varies across admissible assignments while the target requires one fixed-domain ordering, the ordering is not defined on that scope merely because numerical values or branch-local reports happen to coincide. The paper therefore treats measurement-record fixation as prior to the theory-level evidential reuse that depends on it. Boundary-trace normal form After internal and provenance/indexical routes have been exhausted, the residual same-domain route is a singleton stable boundary trace. Such a trace is not collapse dynamics, hidden-variable selection, or a new physical mechanism. It is an admissibility-preserving role anchor that can fix a record-bearing assignment only when its channel, incidence, transport law, original authority, and singleton-positive condition are independently warranted. The result distinguishes: sound partial selection from complete role fixation; unique trace value from unique original occupant; class-valued record fixation from raw-token fixation; later discovery of an original qualification from retroactive repair; physical record occurrence from standing evidential identity. Finite quantum specialization The paper occupies the abstract structure with an explicit finite two-branch quantum measurement domain containing: two outcomes; two fine records and one merged record; denominator-two branch weights; a balanced integer-amplitude state; density-table realization; selective and non-selective instrument maps; environment-record maps; projective branch maps; complementary effects; zero-product projectors; repeatability operations. On the declared balanced witness, amplitude weights, density weights, branch-map traces, effect weights, pointer records, instrument records, environment records, and channel records agree on the same branch architecture. Selective surfaces preserve the fine-record distinction. Non-selective surfaces agree only on the merged record. The fine records therefore remain separated, while the declared non-selective surfaces supply no singleton fine-record selector. The finite selector-boundary theorem eliminates the disjunction of candidate hidden selectors across the state, instrument, environment, channel, effect, and repeatability surfaces. The resulting diagnosis is precise: the missing structure is admissible fine-record role fixation, not further branch production, weighting, decoherence, stabilization, or repeatability. Scope and non-claims The manuscript establishes a finite, conditional, manuscript-facing theorem. It does not claim: to derive Hilbert-space quantum mechanics; to derive general POVM theory; to derive full projection-valued-measure theory; to reconstruct the full operator algebra; to provide a general Kraus representation theorem; to reconstruct complete positivity; to derive the continuum Born rule; to derive universal physical decoherence theory; to introduce a new collapse dynamics; to prove that no physical collapse process occurs in nature; to prove physical branch selection; to establish interpretive truth; to classify every possible physical measurement mechanism. The absence of a hidden selector on the declared finite non-selective surfaces is therefore not a theorem that no physical collapse or selection process can occur elsewhere. It is the finite theorem that those declared surfaces do not themselves supply the required fine-record selector. Relation to quantum interpretations The result does not deny the practical success of quantum theory, decoherence, branch-relative reporting, instrumental updates, or decision-theoretic methods. A practice aimed only at prediction, branch-local reporting, or instrumental updating may be a different target from the construction-relative record use studied here. If a theory claims to underwrite retained, prospective, deliberative, and evidential reuse of the same record-bearing construction token, it must preserve the relevant kernel roles and admit a standing-bearing fixation regime. Bare Everettian dynamics, without additional dynamics, ontological privileging, or admissible restriction to one constructional class, supplies no fine-record selector on the declared target. A strategy that preserves non-selective physics while restricting admissible record-fixation assignments belongs to a restriction-to-one-constructional-class route. Instrumentalist and QBist strategies instead reduce or redirect the target explanatory burden. Role in the AASC programme This paper provides the record-fixation layer of the AASC Quantum Determinacy Pair. Its companion Bell-scope work addresses the compatibility and no-signaling side of quantum witness determinacy. Together, the pair treats quantum records and witnesses as kernel-governed standing structures rather than as automatically determinate physical occurrences. The paper’s principal contribution is to identify the first failure point in a physically non-selective measurement regime: The initial problem is not necessarily the production of branch-local outcomes. It is the admissible fixation of the record role through which outcomes are retained, reported, remembered, compared, and used as evidence. The public Lean 4 formalization is synchronized with the finite measurement-boundary release v0.9.1 and provides the finite artifact for the declared effect, projector, compatibility, closed-stack, boundary-certificate, and audit layers. Keywords AASC; measurement problem; quantum measurement; measurement-record fixation; physically non-selective regimes; Everettian non-selection; record-role determinacy; fixed-domain quotient; standing equivalence; boundary-trace fixation; selector exhaustion; decoherence; branch-local records; admissibility and irreversibility; Lean 4 formalization