Section 6 — Answer-Valued Self-Improvement Slice Transport #
This file contains the answer-valued analogues of the Section 6 slice-transport
constructors. The ordinary construction, including selfImprovementInInductionSection,
lives in SelfImprovementAssembly.Core and is imported here so that the
answer-valued construction can reuse the same Section 9 self-improvement
theorem.
References #
blueprint/src/chapter/ch10_induction.tex
A covariant diagonal measurement with a fixed zero polynomial outcome.
This measurement is used only as an inert diagonal component when applying the axis-parallel/self-consistency form of self-improvement to an answer-valued slice. The Section 9 conclusion obtained in this way is independent of the diagonal-line failure probability.
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Forget the answer-valued diagonal alphabet of a restricted slice, replacing it by an inert ordinary diagonal measurement.
The point, axis-parallel, state, and normalization data are unchanged. This is therefore sufficient for the self-improvement theorem variant whose hypotheses are exactly the axis-parallel and point self-consistency bounds.
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Restrict an answer-valued diagonal-line measurement to the slice at height
x.
This is the answer-valued analogue of restrictDiagonalAnswerMeasurement.
Because the diagonal answer alphabet is the full function space on the line,
restriction is the total map
DiagonalLineAnswer.restrictAtHeight; no low-degree support theorem is needed
to define this slice.
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Evaluating the answer-valued restricted diagonal measurement at the base point recovers the ambient answer-valued diagonal readout.
The x-restricted strategy of an answer-valued successor strategy.
Paper origin: references/ldt-paper/inductive_step.tex:436-455, in the
answer-valued strategy interface used for the recursive slice call.
This is the recursive restriction map needed for a simultaneous answer-valued form of the main induction theorem. It preserves the state, point measurement, axis-parallel measurement, and full answer-valued diagonal measurement on the slice.
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Answer-valued slice restriction does not change the bipartite state.
Answer-valued slice restriction reindexes point questions by appending the slice height.
Answer-valued slice restriction reuses the parent normalization witness.
The diagonal measurement of an answer-valued slice is the full answer-valued restriction of the ambient diagonal measurement.
Transport data for producing the answer-valued self-improvement data from concrete per-slice symmetric strategies.
Paper origin: references/ldt-paper/inductive_step.tex:461-551 and
references/ldt-paper/self_improvement.tex:631-811; this is the answer-valued
restricted-slice interface for the same self-improvement step.
The answer-valued restriction xRestrictedAnswerSymStrat has the paper-faithful
answer-valued diagonal interface, while the existing Section 9 self-improvement
theorem is stated for ordinary SymStrats. This structure records the
stronger route through concrete ordinary slice strategies, together with the
state and point-measurement transports needed to move the resulting conclusions
back to the answer-valued restricted bookkeeping.
The legacy restricted strategy xRestrictedStrategy is not such an ordinary
slice strategy. It is a RestrictedSymStrat, and its diagonal measurement is
only the degree-bounded re-embedding of the sampled base-point value. Thus it
does not by itself supply the transport-covariant diagonal measurement required
by SymStrat.
An ordinary covariant realization is not a formal relabelling of the
answer-valued strategy. Diagonal covariance after rebasing a line would force
the ordinary polynomial outcome to reproduce all values of the function answer,
not only the value at zeroCoord used by the diagonal test. Thus this route
requires a genuine low-degree support/interpolation theorem for the
answer-valued diagonal measurement. In the absence of such a theorem, the
mathematically faithful remaining target is an induction-section
self-improvement theorem stated directly for AnswerSymStrat.
The Section 9 analytic proof debt is not stored in this record. The data record
constructor below calls the paper-facing theorem
selfImprovementInInductionSection; its proof applies the Section 9 theorem and
then transports the output estimates to the answer-valued induction notation.
Concrete symmetric strategies realizing the answer-restricted slice interfaces.
Each concrete slice strategy uses the ambient state.
- pointMeasurement_eq (x : Fq params) : (self.sliceStrategy x).pointMeasurement = (xRestrictedAnswerSymStrat params strategy x).pointMeasurement
Its point measurement agrees with the answer-valued restricted-slice point interface.
- averagedPoint_eq (x : Fq params) (h : Polynomial params) : IdxPolyFamily.averagedPointEvaluationOperator (self.sliceStrategy x) h = IdxPolyFamily.averagedSlicePointEvaluationOperator strategy x h
Its averaged point operator is the averaged slice point operator used by Section 6.
- good (x : Fq params) : (self.sliceStrategy x).IsGood (restrictionPkg.profile.axisParallel x) (restrictionPkg.profile.selfConsistency x) (restrictionPkg.profile.diagonal x)
The concrete slice strategy is good with the answer-restricted failure profile.
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The averaged point-operator compatibility for answer-valued slices follows from point-measurement transport.
Both sides unfold to the same average over strategy.pointMeasurement (appendPoint params u x) once the concrete slice point measurement is identified
with xRestrictedAnswerSymStrat.
Build answer-valued SliceStrategyTransport without separately assuming averaged
point-operator compatibility.
Paper origin: references/ldt-paper/inductive_step.tex:461-551; the averaged
point-operator compatibility is a formal transport between the answer-valued
restricted slice interface and the Section 9 interface.
The structural averaged-point field is derived from pointMeasurement_eq; the
remaining inputs are the concrete slice strategies, their state transport, and
their restricted-profile goodness.
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Transport answer-restricted goodness to a concrete slice strategy once the
state and verifier-visible measurements agree with xRestrictedAnswerSymStrat.
The diagonal compatibility is stated only after postprocessing both diagonal
answer alphabets to their zeroCoord value; this is the comparison used by the
LDT diagonal subtest and avoids claiming a false equality between
DiagonalLinePolynomial and DiagonalLineAnswer families.
Build answer-valued SliceStrategyTransport from concrete slice strategies and
verifier-visible measurement transport.
Paper origin: references/ldt-paper/inductive_step.tex:461-551 and
references/ldt-paper/self_improvement.tex:631-811.
This constructor fills both structural fields forced by the answer-restricted interface: averaged point compatibility follows from point-measurement transport, and goodness follows from the answer-restricted failure profile plus state, axis-parallel, and diagonal zero-coordinate transport.
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Convert the slice-wise outputs feeding the answer-valued restricted-strategy self-improvement stage into the bookkeeping object expected by the answer-valued successor-step construction.
Paper origin: references/ldt-paper/inductive_step.tex:461-551 and
references/ldt-paper/self_improvement.tex:631-811.
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Concrete answer-valued slice strategies give the slice-wise Section 9 outputs used by the answer-valued self-improvement data.
Paper origin: references/ldt-paper/inductive_step.tex:461-551 and
references/ldt-paper/self_improvement.tex:631-811.
This is an internal transport theorem. It applies
selfImprovementInInductionSection to each ordinary slice strategy supplied by
SliceStrategyTransport, and then rewrites the state, point-measurement, and
averaged-point conclusions back into the answer-restricted notation of the
successor step.
The answer-valued restricted slices directly give the slice-wise Section 9 outputs once self-improvement is applied in its axis-parallel/self-consistency form.
Paper origin: references/ldt-paper/inductive_step.tex:461-551 and
references/ldt-paper/self_improvement.tex:631-811.
The ordinary carrier used in the proof keeps the slice state, point measurement, and axis-parallel measurement, and replaces only the diagonal measurement by an inert covariant measurement. This is sufficient because the called self-improvement theorem consumes only the axis-parallel and point self-consistency bounds.
Convert concrete per-slice structural data into the answer-valued Section 6 self-improvement data.
Paper origin: references/ldt-paper/inductive_step.tex:461-551 and
references/ldt-paper/self_improvement.tex:631-811.
The construction assumes ordinary slice strategies and their structural
measurement transports. It applies the theorem
selfImprovementInInductionSection slice-by-slice and transports its fields
back to the answer-valued restricted-slice interface via the recorded state and
point-measurement equalities.
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Construct the answer-valued Section 6 self-improvement data directly from the answer-valued restricted slices.
Paper origin: references/ldt-paper/inductive_step.tex:461-551 and
references/ldt-paper/self_improvement.tex:631-811.
This removes the ordinary slice-realization assumption from the self-improvement stage. The construction uses the ordinary carrier only as a device for invoking the Section 9 theorem in the form whose hypotheses are the axis-parallel and point self-consistency estimates.
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