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Question 15036: A Strict Rational Tail Cutoff Is Different from a Finite Prefix

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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R0029-15036 · q-20261014-advance-20261030-r07-convergence-in-probability-0036

Original question and givens

Use the declared rational deviation-probability tail p_n=1/(n+5) on nonnegative integer indices where this value belongs to[0,1], starting no earlier than max(0,numerator-shift). The common probability space and infinite-process interpretation remain declared premises, not constructions inferred from finitely many numbers. Keep exact reduced rational outputs with positive denominators, omitting /1 for integers. Use positive target delta=1/20. Give (numerator,shift,delta,minimal_nonnegative_N,bound_at_N,strict_tail?,forall_n_ge_N_tail_bound).

  • G001 — Use the declared rational deviation-probability tail p_n=1/(n+5) on nonnegative integer indices where this value belongs to[0,1], starting no earlier than max(0,numerator-shift). The common probability space and infinite-process interpretation remain declared premises, not constructions inferred from finitely many numbers. Keep exact reduced rational outputs with positive denominators, omitting /1 for integers. Use positive target delta=1/20. Give (numerator,shift,delta,minimal_nonnegative_N,bound_at_N,strict_tail?,forall_n_ge_N_tail_bound).

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

positive profile parameters c=1;s=5;raw fraction=c/(n+s)

After

nonnegative valid probability indices start at=0;only there0<profile<=1

Conditions: none

A positive denominator and value≤1 require n+s≥c.Keep the original index;do not clip values above1 or silently shift them.This checks arithmetic domain only.The infinite-process/common-space interpretation remains declared,and the prefix-only family gains no infinite continuation premise.

Step identifiers and dependencies

Rule: deviation_profile_probability_domain_not_clipping · Uses: G001

S002 · calculation

Before

strict profile cross-product numerator := mul(1, 20)

After

strict profile cross-product numerator = 20

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,strict guards,indices and signs.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · calculation

Before

strict profile reciprocal threshold := div(20, 1)

After

strict profile reciprocal threshold = 20

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,strict guards,indices and signs.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

strict profile unclamped cutoff := sum(20, -5, 1)

After

strict profile unclamped cutoff = 16

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,strict guards,indices and signs.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · implies

Before

raw target delta=[1, 20];normalized delta=1/20;positive denominator target numerator=1

After

floor(c*delta_denominator/delta_numerator)=20;threshold=20;raw least nonnegative strict N=16

Conditions: none

The strict inequality c/(N+s)<a/b is equivalent to N+s>cb/a,hence floor(cb/a)−s+1 clamped only at0.Equality still requires the next index.

Step identifiers and dependencies

Rule: strict_integer_cutoff_floor_and_nonnegative_boundary · Uses: G001, S004

S006 · calculation

Before

strict witness denominator := sum(16, 5)

After

strict witness denominator = 21

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,strict guards,indices and signs.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · calculation

Before

strict witness valid probability bound := div(1, 21)

After

strict witness valid probability bound = 1/21

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,strict guards,indices and signs.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

previous raw reciprocal denominator := sum(15, 5)

After

previous raw reciprocal denominator = 20

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,strict guards,indices and signs.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · calculation

Before

previous raw reciprocal value := div(1, 20)

After

previous raw reciprocal value = 1/20

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,strict guards,indices and signs.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S008

S010 · implies

Before

N=16;current valid probability=1/21;previous RAW reciprocal=1/20;delta=1/20

After

current strict bound holds,previous raw threshold fails;N is minimal

Conditions: none

The previous arithmetic reciprocal is still≥delta,so every smaller index fails the original strict threshold.If that earlier index is outside the probability domain,it is only a raw reciprocal,not a probability above1.The returned N must pass the original English domain guard;do not max-shift the source answer.

Step identifiers and dependencies

Rule: strict_profile_minimality_without_invalid_probability_claim · Uses: G001, S009

S011 · implies

Before

declared same-space deviation profile on valid tail;n>=N=16;positive denominators increase

After

every later profile<=bound=1/21<delta=1/20

Conditions: none

Conditionally on the declared deviation profile,increasing denominators bound every later index.This selected-delta witness neither constructs a common process from numbers nor proves all-epsilon convergence of an unknown sequence from finite data.

Step identifiers and dependencies

Rule: probability_tail_all_later_indices_not_samples · Uses: G001, S010

Reverse checks

  • S011 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S010 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S009 · premise_and_result_audit — Recompute previous raw reciprocal value with exact rational arithmetic, not rounded decimals.
  • S008 · premise_and_result_audit — Recompute previous raw reciprocal denominator with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute strict witness valid probability bound with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Recompute strict witness denominator 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 — Recompute strict profile unclamped cutoff with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute strict profile reciprocal threshold with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Recompute strict profile cross-product numerator with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

(1, 5, 1/20, 16, 1/21, Yes, forall_n_ge_N_tail_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: 6f67e463de5e32f3641e885843e7d681fa0a5e15a978c4b6f57b59cbaeebd72b
  • candidate record SHA-256: 4b4f38b809dec1e2de2e12ce38530c110a5f6ba4a6e02e4e89b8b5936165a2a7
  • semantic review receipt SHA-256: 8c0ef6ca8c5ba2754e41f30c2b32bcb757756152d97421f7396d39038c11f725
  • question-first witness SHA-256: c7920a0ff8e724b7e566ebbda30b31d8087c136974b62f8c760fbd26ab816117
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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