Every neighbor is no better, but a nonneighbor is strictly better, giving an explicit local-but-not-global witness.
Step identifiers and dependencies
Rule: local_global_separation · 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 neighbor f(B)−f(A) 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
(local_not_global, A, 38, [B], Yes, No, local_minimum_does_not_imply_global_minimum)
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.