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Question 21419: A Finite Prefix Supplies No Whole-Sequence or Infinite-Subsequence 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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R0041-21419 · q-20261014-advance-20261109-r02-bolzano-weierstrass-theorem-real-0094

Original question and givens

Only the finite prefix values=[18, 19, 18, 20] is given; no infinite continuation is specified. Give (prefix, whole_sequence_boundedness_certified, infinite_subsequence_certified, convergence_certified, boundary).

  • G001 — Only the finite prefix values=[18, 19, 18, 20] is given; no infinite continuation is specified. Give (prefix, whole_sequence_boundedness_certified, infinite_subsequence_certified, convergence_certified, 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 operation=bw-finite-prefix-boundary;original snapshot and mathematics retained

After

explicit ordered source output fields=[prefix, whole_sequence_boundedness_certified, infinite_subsequence_certified, convergence_certified, boundary]

Conditions: none

Retain the historical interface marker while listing ordered output fields without JavaScript.Fields and tags are not extra mathematical evidence;fixed No markers retain their claim scope.

Step identifiers and dependencies

Rule: source_ordered_interface_explicit_without_javascript · Uses: G001

S002 · implies

Before

ORIGINAL finite prefix only=[18, 19, 18, 20];NO infinite law specified

After

whole_sequence_boundedness_certified=No;infinite_subsequence_certified=No;convergence_certified=No;these are missing certificates,NOT claims every continuation is unbounded/divergent

Conditions: none

A finite prefix can admit bounded or unbounded extensions.Without a whole sequence law,a finite cluster search supplies neither an infinite index map nor an all-later convergence certificate.The three No markers do not classify unknown continuations.

Step identifiers and dependencies

Rule: bw_finite_prefix_nonclaims_not_unknown_continuation_negation · Uses: G001, S001

Reverse checks

  • 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

([18, 19, 18, 20], No, No, No, finite_prefix_cannot_certify_whole_sequence_boundedness_or_infinite_convergent_subsequence)

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: 1f5fb06bd3ea6a0a2d4dd0f5b8ef6e26960c2d475349f0d5fbd0023bc17cc9c7
  • candidate record SHA-256: 9225f27b243f6c304c55c22255f68e2b595a887b45ea4f1bfc51783e550d0a62
  • semantic review receipt SHA-256: 8f134403487694af4c70d2e00ec84bab542043ef4b3c54517c04f3c409c0262a
  • question-first witness SHA-256: ad772845088ed8e99f87f90d4264b05ea97be35775305a02011af5ee35f0f4ce
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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