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Question 865: One Strictly Better Feasible Point Refutes Candidate Global Optimality

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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P1000-0865 · q-20261015-pulse-20261119-r07-0040

Original question and givens

Use the complete finite feasible carrier=[A, B, C, D] with aligned exact objective values=[45, 15, 60, 75], candidate=A. The declared feasible challenger is=B. Give (complete_objective_table, candidate, candidate_value, challenger, challenger_value, strict_feasible_improvement, candidate_global_optimality_claim, refutation_scope).

  • G001 — Use the complete finite feasible carrier=[A, B, C, D] with aligned exact objective values=[45, 15, 60, 75], candidate=A. The declared feasible challenger is=B. Give (complete_objective_table, candidate, candidate_value, challenger, challenger_value, strict_feasible_improvement, candidate_global_optimality_claim, refutation_scope).

Definition and scope

Minimization over a complete finite feasible set; one strictly smaller feasible point refutes the candidate's global optimality.

Step-by-step derivation

S001 · implies

Before

complete feasible domain

After

[[A, 45], [B, 15], [C, 60], [D, 75]]

Conditions: none

Fix the complete table and minimization direction; sampling a few points is not a global certificate.

Step identifiers and dependencies

Rule: complete_objective_data · Uses: G001

S002 · implies

Before

candidate=A; challenger=B

After

both feasible; f(candidate)=45, f(challenger)=15

Conditions: none

First check that the challenger is a distinct feasible point.

Step identifiers and dependencies

Rule: feasible_challenger · Uses: G001, S001

S003 · calculation

Before

challenger minus candidate := sub(15, 45)

After

challenger minus candidate = -30

Conditions: none

Subtract exactly; a strictly negative difference certifies improvement.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

difference=-30<0

After

candidate cannot minimize over all feasible points

Conditions: none

Global minimality requires a value no greater than every feasible value; one strictly better point refutes it.

Step identifiers and dependencies

Rule: strict_improvement_obstruction · Uses: G001, S003

Reverse checks

  • S004 · premise_and_result_audit — Completeness, neighborhoods, attainment and uniqueness are separate obligations; local data do not license a global conclusion.
  • S003 · premise_and_result_audit — Recompute challenger minus candidate with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Completeness, neighborhoods, attainment and uniqueness are separate obligations; local data do not license a global conclusion.
  • S001 · premise_and_result_audit — Completeness, neighborhoods, attainment and uniqueness are separate obligations; local data do not license a global conclusion.

Result

([[A, 45], [B, 15], [C, 60], [D, 75]], A, 45, B, 15, Yes, No, one_strictly_better_feasible_point_refutes_candidate_global_optimality)

The full substitutions and premise audits recover the original answer, retaining its field order and verdict meanings.

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: 1cefdc456821f64a9a1837bda114a71bb652a9bf0be81ee70702443a4ee9fb8a
  • candidate record SHA-256: e6b974780a1160504cc6fae9bfd2c4aedafab08405b082b48e78ca8e392576f9
  • semantic review receipt SHA-256: 6c2c6d46aded7582a11ac41a8c0b3bdde2669a53bdb6e796eea2039994a02772
  • question-first witness SHA-256: 77e43898df9efdbf8094ad81fe4ab91cf4b4bd82f481eb9b4699b73cb4da612b
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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