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Question 33936: An Affine Map Propagates an Absolute Input Bound by Its Absolute Slope

On this page
  1. Original question and givens
  2. Definition and scope
  3. Step-by-step derivation
  4. Reverse checks
  5. Result
  6. This question review and source binding

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R0066-33936 · q-20261015-pulse-20261119-r05-0036

Original question and givens

Use slope=2 and nonnegative absolute input error bound=11/3. Give (slope, input_absolute_error_bound, output_absolute_error_bound, scope).

  • G001 — Use slope=2 and nonnegative absolute input error bound=11/3. Give (slope, input_absolute_error_bound, output_absolute_error_bound, scope).

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

Step-by-step derivation

S001 · implies

Before

source roles = [qf-mod50-numerr-affine-propagation, [domain, input_error_bound, operation, slope]]

After

derived = [numerr-affine-propagation, Exact_numerical_error_density]

Conditions: none

THIS source uses LOCAL-hyphen operations with exact keys/domain.Keep source field order and numeric/Boolean/string roles;integer rational texts omit/1.Original questions,English,MKOs,ASTs and statuses remain unchanged.

Step identifiers and dependencies

Rule: R66_EXACT_source_bank_keys_local_operation_domain · Uses: G001

S002 · implies

Before

source roles = [propagation ORIGINAL slope, 100000000, 2, 1]

After

derived = [[2, 1], 2]

Conditions: none

Bound the SOURCE PRE-reduction numerator/denominator and require a nonzero denominator BEFORE sign/gcd normalization.MOD50 uses100million with NAIVE operations,not prior cross-cancellation;this Wave4 mean uses one million.Out-of-envelope is a source-slice hold,not mathematical falsity.

Step identifiers and dependencies

Rule: R66_SOURCE_PREreduction_components_then_sign_gcd · Uses: G001, S001

S003 · calculation

Before

propagation ORIGINAL slope ORIGINAL numerator over denominator := div(2, 1)

After

propagation ORIGINAL slope ORIGINAL numerator over denominator = 2

Conditions: none

Calculate exactly from THIS step’s ORIGINAL ordered operands.Retain the SOURCE rational pre-reduction envelope separately;do not use floating values or silently widen a different bank.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

source roles = [propagation ORIGINAL input bound, 100000000, 11, 3]

After

derived = [[11, 3], 11/3]

Conditions: none

Bound the SOURCE PRE-reduction numerator/denominator and require a nonzero denominator BEFORE sign/gcd normalization.MOD50 uses100million with NAIVE operations,not prior cross-cancellation;this Wave4 mean uses one million.Out-of-envelope is a source-slice hold,not mathematical falsity.

Step identifiers and dependencies

Rule: R66_SOURCE_PREreduction_components_then_sign_gcd · Uses: G001, S003

S005 · calculation

Before

propagation ORIGINAL input bound ORIGINAL numerator over denominator := div(11, 3)

After

propagation ORIGINAL input bound ORIGINAL numerator over denominator = 11/3

Conditions: none

Calculate exactly from THIS step’s ORIGINAL ordered operands.Retain the SOURCE rational pre-reduction envelope separately;do not use floating values or silently widen a different bank.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · implies

Before

source roles = [Affine output error bound SOURCE naive mul, 100000000, 22, 3]

After

derived = [[22, 3], 22/3]

Conditions: none

Bound the SOURCE PRE-reduction numerator/denominator and require a nonzero denominator BEFORE sign/gcd normalization.MOD50 uses100million with NAIVE operations,not prior cross-cancellation;this Wave4 mean uses one million.Out-of-envelope is a source-slice hold,not mathematical falsity.

Step identifiers and dependencies

Rule: R66_SOURCE_PREreduction_components_then_sign_gcd · Uses: G001, S005

S007 · calculation

Before

Affine output error bound SOURCE naive mul ORIGINAL numerator over denominator := div(22, 3)

After

Affine output error bound SOURCE naive mul ORIGINAL numerator over denominator = 22/3

Conditions: none

Calculate exactly from THIS step’s ORIGINAL ordered operands.Retain the SOURCE rational pre-reduction envelope separately;do not use floating values or silently widen a different bank.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

Affine output error bound ORIGINAL rational mul := mul(2, 11/3)

After

Affine output error bound ORIGINAL rational mul = 22/3

Conditions: none

Calculate exactly from THIS step’s ORIGINAL ordered operands.Retain the SOURCE rational pre-reduction envelope separately;do not use floating values or silently widen a different bank.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · implies

Before

source roles = [2, 11/3]

After

derived = [22/3]

Conditions: none

Use |m(x+δ)+b−(mx+b)|=|m|*|δ|≤|m|*bound.The bound is nonnegative;zero slope or bound is allowed.This is THIS affine model’s absolute bound,not identification of rounding/truncation/measurement sources or a convergence proof.

Step identifiers and dependencies

Rule: Error_AFFINE_propagation_absolute_bound_INCLUDES_zero · Uses: G001, S008

Reverse checks

  • S009 · premise_and_result_audit — Reverse-audit THIS step against its ORIGINAL ordered roles and complete premises.Accept the conclusion only under these conditions;do not invert a one-way implication or call a finite check a general formal proof.
  • S008 · premise_and_result_audit — Recompute Affine output error bound ORIGINAL rational mul with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute Affine output error bound SOURCE naive mul ORIGINAL numerator over denominator with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Reverse-audit THIS step against its ORIGINAL ordered roles and complete premises.Accept the conclusion only under these conditions;do not invert a one-way implication or call a finite check a general formal proof.
  • S005 · premise_and_result_audit — Recompute propagation ORIGINAL input bound ORIGINAL numerator over denominator with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Reverse-audit THIS step against its ORIGINAL ordered roles and complete premises.Accept the conclusion only under these conditions;do not invert a one-way implication or call a finite check a general formal proof.
  • S003 · premise_and_result_audit — Recompute propagation ORIGINAL slope ORIGINAL numerator over denominator with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Reverse-audit THIS step against its ORIGINAL ordered roles and complete premises.Accept the conclusion only under these conditions;do not invert a one-way implication or call a finite check a general formal proof.
  • S001 · premise_and_result_audit — Reverse-audit THIS step against its ORIGINAL ordered roles and complete premises.Accept the conclusion only under these conditions;do not invert a one-way implication or call a finite check a general formal proof.

Result

(2, 11/3, 22/3, affine_output_absolute_error_bound)

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.

Source hashes and review receipts
  • input commit: 0f7be61e2c22317a4075561dc822c87d881a50db
  • original question SHA-256: f5e5432b4c0d0eccf3d17f027d17a6f61fb97deae8aed042293a00f22e644419
  • candidate record SHA-256: 3a5571594c48002e6684f06cc329c9b2eecedcb7bfe2d08251494caf82d31b29
  • semantic review receipt SHA-256: 99b4f114b2ec93164b6aa5681e0107033a240e7a3f0a8988633ba65320ede267
  • question-first witness SHA-256: d9bd3a1940da8a73f790ee3fe460c9a8523791bdbe72c8e0304e3740b66710cc
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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