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Question 16089: A Null Atom Can Fail Pointwise without Changing the Almost-Sure Claim

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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R0031-16089 · q-20261014-advance-20261101-r04-almost-sure-convergence-0064

Original question and givens

Use one complete finite atomic probability space with aligned exact nonnegative masses=[1/2, 1/2, 0/1], summing to 1, and supplied full-tail settling_indices=[14, 15, null]. An integer N declares equality to the common limit from that index onward on this atom; null denotes a model-declared nonconvergent atom, not merely a missing file or unchecked proof receipt. Every positive-mass atom must converge; a zero-mass failure is ignored only for the almost-sure claim. Keep exact reduced rational text, omitting /1 for integers. A finite observed prefix alone is not this universal-tail certificate. Selected atom=2 must actually have zero mass. Give (atom,mass,settling_index,ignored?,almost_sure?,zero_mass_failure_ignored_only_for_almost_sure_claim).

  • G001 — Use one complete finite atomic probability space with aligned exact nonnegative masses=[1/2, 1/2, 0/1], summing to 1, and supplied full-tail settling_indices=[14, 15, null]. An integer N declares equality to the common limit from that index onward on this atom; null denotes a model-declared nonconvergent atom, not merely a missing file or unchecked proof receipt. Every positive-mass atom must converge; a zero-mass failure is ignored only for the almost-sure claim. Keep exact reduced rational text, omitting /1 for integers. A finite observed prefix alone is not this universal-tail certificate. Selected atom=2 must actually have zero mass. Give (atom,mass,settling_index,ignored?,almost_sure?,zero_mass_failure_ignored_only_for_almost_sure_claim).

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 · calculation

Before

almost-sure full probability mass := sum(1/2, 1/2, 0)

After

almost-sure full probability mass = 1

Conditions: none

Compute exactly from original field roles and established intermediates,retaining denominators,signs,indices and the complete carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001

S002 · implies

Before

same complete finite atomic space;raw masses=[[1, 2], [1, 2], [0, 1]];raw settling declarations=[14, 15, null]

After

normalized nonnegative masses=[1/2, 1/2, 0];total=1;integer N means equality to common limit at EVERY later index;null means model-declared nonconvergence

Conditions: none

Fix the same probability space and aligned atoms.An integer N declares equality on the entire later tail;null is model-declared nonconvergence,not an unchecked or missing receipt.These universal declarations cannot be manufactured from a finite observation.

Step identifiers and dependencies

Rule: asconv_declared_full_trajectory_model_not_missing_receipt · Uses: G001, S001

S003 · implies

Before

original atom=0;exact mass=1/2;full-tail declaration=14

After

atom row=[0, 1/2, 14, Yes, Yes]

Conditions: none

Every positive-mass atom must have its convergent-tail declaration.A zero-mass failure may be ignored only for an almost-sure claim.Keep every atom's original order,mass and declaration;do not delete null atoms and pretend the statement holds everywhere.

Step identifiers and dependencies

Rule: asconv_each_positive_atom_obligation_and_null_exception · Uses: G001, S002

S004 · implies

Before

original atom=1;exact mass=1/2;full-tail declaration=15

After

atom row=[1, 1/2, 15, Yes, Yes]

Conditions: none

Every positive-mass atom must have its convergent-tail declaration.A zero-mass failure may be ignored only for an almost-sure claim.Keep every atom's original order,mass and declaration;do not delete null atoms and pretend the statement holds everywhere.

Step identifiers and dependencies

Rule: asconv_each_positive_atom_obligation_and_null_exception · Uses: G001, S003

S005 · implies

Before

original atom=2;exact mass=0;full-tail declaration=null

After

atom row=[2, 0, null, No, Yes]

Conditions: none

Every positive-mass atom must have its convergent-tail declaration.A zero-mass failure may be ignored only for an almost-sure claim.Keep every atom's original order,mass and declaration;do not delete null atoms and pretend the statement holds everywhere.

Step identifiers and dependencies

Rule: asconv_each_positive_atom_obligation_and_null_exception · Uses: G001, S004

S006 · calculation

Before

almost-sure declared nonconvergent exceptional mass := sum(0)

After

almost-sure declared nonconvergent exceptional mass = 0

Conditions: none

Compute exactly from original field roles and established intermediates,retaining denominators,signs,indices and the complete carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · implies

Before

all model-declared nonconvergent atom indices=[2];their total mass=0

After

positive-mass failures=[];almost-sure qualification=Yes

Conditions: none

On this complete finite atomic space,the bad set has mass0 exactly when it contains no positive-mass atom.That gives probability1 without changing actual nonconvergence on a null atom.

Step identifiers and dependencies

Rule: asconv_probability_one_not_every_outcome · Uses: G001, S006

S008 · implies

Before

selected original atom=2;verified mass=0;retained settling declaration=null

After

ignored only for almost-sure test=Yes;all positive atoms still audited;almost-sure qualification=Yes

Conditions: none

Verify actual zero mass before excluding this atom's effect on the almost-sure test.Its declaration remains visible.The ignored flag repairs neither pointwise failure nor failures at other positive atoms.

Step identifiers and dependencies

Rule: asconv_selected_actual_zero_mass_not_pointwise_repair · Uses: G001, S007

Reverse checks

  • S008 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S007 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S006 · premise_and_result_audit — Recompute almost-sure declared nonconvergent exceptional mass with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S004 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S003 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S002 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S001 · premise_and_result_audit — Recompute almost-sure full probability mass with exact rational arithmetic, not rounded decimals.

Result

(2, 0, null, Yes, Yes, zero_mass_failure_ignored_only_for_almost_sure_claim)

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: 90f98a8957b7d4c318aa99e088b44a89106e71c8eb660e7186b305c18c5f6748
  • candidate record SHA-256: 32079068ee8b3abbecdb4746e27f0bea4f36762df6a5337cd3e9218befa9b847
  • semantic review receipt SHA-256: 55bb21783e2125ecf1e67e42f83fd25bec0ccd493f911f4bb937a5e9d6f9369a
  • question-first witness SHA-256: 754ddf2a6039c5ef4aae78a538c6e9a1e9a58d4825aee194e869a27b8a4c95bb
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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