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Question 27626: A Fixed Prefix Mean Is a Finite Audit, Not an Almost-Sure Limit Certificate

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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R0054-27626 · q-20261015-advance-20261118-r02-strong-law-large-numbers-finite-valued-iid-0026

Original question and givens

Use the aligned finite law values=[-2, -1], probabilities=[1/2, 1/2], with declared process certificate=infinite_iid. The token is an explicit infinite IID premise, not a process construction or proof by this finite calculation. The observed finite prefix is=[-2]. Give (observations, common_mean, prefix_sample_mean, absolute_error, evidence_scope, almost_sure_limit_proof_claim, boundary).

  • G001 — Use the aligned finite law values=[-2, -1], probabilities=[1/2, 1/2], with declared process certificate=infinite_iid. The token is an explicit infinite IID premise, not a process construction or proof by this finite calculation. The observed finite prefix is=[-2]. Give (observations, common_mean, prefix_sample_mean, absolute_error, evidence_scope, almost_sure_limit_proof_claim, boundary).

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 = [slln-prefix-sample-mean]

After

derived = [[observations, common_mean, prefix_sample_mean, absolute_error, evidence_scope, almost_sure_limit_proof_claim, boundary]]

Conditions: none

List the complete operation/mode field order without JavaScript or answer-shape inference;Boolean,string,null and an unclaimed result remain distinct.

Step identifiers and dependencies

Rule: source_ordered_fields_without_JS · Uses: G001

S002 · implies

Before

source roles = [infinite_iid]

After

derived = [ASSUME whole infinite sequence is IID with this common marginal]

Conditions: none

infinite_iid is a GIVEN whole-process premise,not independence constructed or proved by finite data/this program.

Step identifiers and dependencies

Rule: SLLN_infinite_IID_EXACT_GIVEN_premise_not_finite_observation_inference · Uses: G001, S001

S003 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL mass sum0 := sum(0, 1/2)

After

SLLN ORIGINAL common marginal ORIGINAL mass sum0 = 1/2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL mass sum1 := sum(1/2, 1/2)

After

SLLN ORIGINAL common marginal ORIGINAL mass sum1 = 1

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL weighted value0 := mul(-2, 1/2)

After

SLLN ORIGINAL common marginal ORIGINAL weighted value0 = -1

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL mean sum0 := sum(0, -1)

After

SLLN ORIGINAL common marginal ORIGINAL mean sum0 = -1

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · calculation

Before

SLLN ORIGINAL common marginal exact unbounded value square0 := mul(-2, -2)

After

SLLN ORIGINAL common marginal exact unbounded value square0 = 4

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL weighted square0 := mul(4, 1/2)

After

SLLN ORIGINAL common marginal ORIGINAL weighted square0 = 2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL second moment sum0 := sum(0, 2)

After

SLLN ORIGINAL common marginal ORIGINAL second moment sum0 = 2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S008

S010 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL weighted value1 := mul(-1, 1/2)

After

SLLN ORIGINAL common marginal ORIGINAL weighted value1 = -1/2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S009

S011 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL mean sum1 := sum(-1, -1/2)

After

SLLN ORIGINAL common marginal ORIGINAL mean sum1 = -3/2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S010

S012 · calculation

Before

SLLN ORIGINAL common marginal exact unbounded value square1 := mul(-1, -1)

After

SLLN ORIGINAL common marginal exact unbounded value square1 = 1

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S011

S013 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL weighted square1 := mul(1, 1/2)

After

SLLN ORIGINAL common marginal ORIGINAL weighted square1 = 1/2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S012

S014 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL second moment sum1 := sum(2, 1/2)

After

SLLN ORIGINAL common marginal ORIGINAL second moment sum1 = 5/2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S013

S015 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL mean squared := mul(-3/2, -3/2)

After

SLLN ORIGINAL common marginal ORIGINAL mean squared = 9/4

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S014

S016 · calculation

Before

SLLN ORIGINAL common marginal ORIGINAL second minus mean squared := sub(5/2, 9/4)

After

SLLN ORIGINAL common marginal ORIGINAL second minus mean squared = 1/4

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S015

S017 · implies

Before

source roles = [SLLN ORIGINAL common marginal, [-2, -1], [[1, 2], [1, 2]]]

After

derived = [[[-2, 1/2], [-1, 1/2]], 1, -3/2, 5/2, 1/4]

Conditions: none

Pair ORIGINAL values/probabilities before numeric sorting and retain zero-mass labels.Qualify the complete nonnegative mass1 law and its source second-minus-mean-square variance.SLLN allows variance0;do not import the CLT positive-variance condition.

Step identifiers and dependencies

Rule: SLLN_complete_ORIGINAL_numeric_value_probability_alignment_ALL_moments · Uses: G001, S016

S018 · calculation

Before

SLLN ORIGINAL prefix integer sum := sum(-2)

After

SLLN ORIGINAL prefix integer sum = -2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S017

S019 · calculation

Before

SLLN ORIGINAL prefix sample mean := div(-2, 1)

After

SLLN ORIGINAL prefix sample mean = -2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S018

S020 · calculation

Before

SLLN ORIGINAL sample mean minus common mean := sub(-2, -3/2)

After

SLLN ORIGINAL sample mean minus common mean = -1/2

Conditions: none

Substitute original roles and established intermediates exactly,not approximations or internally consistent changed operands;extra teaching algebra adds no source-domain gate.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S019

S021 · implies

Before

source roles = [[-2], -3/2, -2, -1/2]

After

derived = [1/2, No]

Conditions: none

Every observation is correctly typed and in the carrier;the prefix must be nonempty.The source uses the UNREDUCED[sum,length]1e6 profile,not an invented8-term cap.One close/equal prefix does not prove an almost-sure limit.

Step identifiers and dependencies

Rule: SLLN_fixed_nonempty_prefix_mean_error_NOT_as_limit_certificate · Uses: G001, S020

Reverse checks

  • S021 · premise_and_result_audit — Reverse-check original data,operands,complete scope and premises;finite witnesses,conditional theorem use and formal proof remain distinct.
  • S020 · premise_and_result_audit — Recompute SLLN ORIGINAL sample mean minus common mean with exact rational arithmetic, not rounded decimals.
  • S019 · premise_and_result_audit — Recompute SLLN ORIGINAL prefix sample mean with exact rational arithmetic, not rounded decimals.
  • S018 · premise_and_result_audit — Recompute SLLN ORIGINAL prefix integer sum with exact rational arithmetic, not rounded decimals.
  • S017 · premise_and_result_audit — Reverse-check original data,operands,complete scope and premises;finite witnesses,conditional theorem use and formal proof remain distinct.
  • S016 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL second minus mean squared with exact rational arithmetic, not rounded decimals.
  • S015 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL mean squared with exact rational arithmetic, not rounded decimals.
  • S014 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL second moment sum1 with exact rational arithmetic, not rounded decimals.
  • S013 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL weighted square1 with exact rational arithmetic, not rounded decimals.
  • S012 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal exact unbounded value square1 with exact rational arithmetic, not rounded decimals.
  • S011 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL mean sum1 with exact rational arithmetic, not rounded decimals.
  • S010 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL weighted value1 with exact rational arithmetic, not rounded decimals.
  • S009 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL second moment sum0 with exact rational arithmetic, not rounded decimals.
  • S008 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL weighted square0 with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal exact unbounded value square0 with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL mean sum0 with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL weighted value0 with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL mass sum1 with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute SLLN ORIGINAL common marginal ORIGINAL mass sum0 with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Reverse-check original data,operands,complete scope and premises;finite witnesses,conditional theorem use and formal proof remain distinct.
  • S001 · premise_and_result_audit — Reverse-check original data,operands,complete scope and premises;finite witnesses,conditional theorem use and formal proof remain distinct.

Result

([-2], -3/2, -2, 1/2, fixed_prefix_only, No, finite_prefix_does_not_prove_almost_sure_convergence)

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: ac814996ae1f4b571228c45de3069084c90cac4708109263f29f3d8782bd52c4
  • candidate record SHA-256: b534bd9ca22133917050ecdae7e5d6d8512a980739e4b77cb80e76a7c26509cc
  • semantic review receipt SHA-256: 0a76d8e93c08bb16998a0483f3dfc0504f269fc3e1982e6cd868cab0a2856d54
  • question-first witness SHA-256: 09127b736c225714dfa0b7ceb0e6a6e66df27438b480cad8217d3c2f99ce9437
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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