Question 887: A Complete Attained Lower Bound Certifies Globality but Not Automatic Uniqueness

Original question and givens

Use the complete finite feasible carrier=[A, B, C, D] with aligned exact objective values=[12, 24, 36, 48], candidate=A. The declared global lower bound is=12. Give (complete_objective_table, lower_bound, candidate, candidate_value, all_values_above_bound, bound_attained, global_optimum, unique, all_global_minimizers, certificate_scope).

• G001 — Use the complete finite feasible carrier=[A, B, C, D] with aligned exact objective values=[12, 24, 36, 48], candidate=A. The declared global lower bound is=12. Give (complete_objective_table, lower_bound, candidate, candidate_value, all_values_above_bound, bound_attained, global_optimum, unique, all_global_minimizers, certificate_scope).

Definition and scope

A complete lower bound attained at the candidate proves global minimality; uniqueness is decided separately by the attaining set.

• mko-optimization-problem

Step-by-step derivation

complete feasible domain

[[A, 12], [B, 24], [C, 36], [D, 48]]

f(A)−L := sub(12, 12)

f(A)−L = 0

f(B)−L := sub(24, 12)

f(B)−L = 12

f(C)−L := sub(36, 12)

f(C)−L = 24

f(D)−L := sub(48, 12)

f(D)−L = 36

all f(x)≥L=12

f(A)=12=L; attained=Yes

all attaining points=[A]

global=true; unique=Yes

Reverse checks

• S007 · premise_and_result_audit — Completeness, neighborhoods, attainment and uniqueness are separate obligations; local data do not license a global conclusion.
• S006 · premise_and_result_audit — Completeness, neighborhoods, attainment and uniqueness are separate obligations; local data do not license a global conclusion.
• S005 · premise_and_result_audit — Recompute f(D)−L with exact rational arithmetic, not rounded decimals.
• S004 · premise_and_result_audit — Recompute f(C)−L with exact rational arithmetic, not rounded decimals.
• S003 · premise_and_result_audit — Recompute f(B)−L with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Recompute f(A)−L with exact rational arithmetic, not rounded decimals.
• S001 · premise_and_result_audit — Completeness, neighborhoods, attainment and uniqueness are separate obligations; local data do not license a global conclusion.

Result

([[A, 12], [B, 24], [C, 36], [D, 48]], 12, A, 12, Yes, Yes, Yes, Yes, [A], complete_lower_bound_plus_attainment_certifies_global_but_not_automatic_uniqueness)

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.