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Question 33826: Stationarity, Metric Identification and Finite Differences Have Different Responsibilities

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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R0066-33826 · q-20261015-pulse-20261119-r06-0076

Original question and givens

Use mode=zero_gradient, complete model={"dimension":1}. Give (mode, dimension, zero_gradient, stationary, minimum_claim, boundary).

  • G001 — Use mode=zero_gradient, complete model={"dimension":1}. Give (mode, dimension, zero_gradient, stationary, minimum_claim, 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 roles = [qf-mod50-graddeep-boundary, [domain, mode, model, operation]]

After

derived = [graddeep-boundary, Exact_gradient_vector_density]

Conditions: none

THIS source uses LOCAL-hyphen operations with exact keys/domain.Keep source field order and numeric/Boolean/string roles;integer rational texts omit/1.Original questions,English,MKOs,ASTs and statuses remain unchanged.

Step identifiers and dependencies

Rule: R66_EXACT_source_bank_keys_local_operation_domain · Uses: G001

S002 · implies

Before

source roles = [zero_gradient, 1]

After

derived = [[0], Yes, No]

Conditions: none

A zero gradient certifies stationarity ONLY.For example−sum x_i² has gradient0 at0 but a maximum,so zero gradient cannot certify a minimum.

Step identifiers and dependencies

Rule: Gradient_ZERO_stationary_not_minimum · Uses: G001, S001

Reverse checks

  • S002 · premise_and_result_audit — Reverse-audit THIS step against its ORIGINAL ordered roles and complete premises.Accept the conclusion only under these conditions;do not invert a one-way implication or call a finite check a general formal proof.
  • S001 · premise_and_result_audit — Reverse-audit THIS step against its ORIGINAL ordered roles and complete premises.Accept the conclusion only under these conditions;do not invert a one-way implication or call a finite check a general formal proof.

Result

(zero_gradient, 1, [0], Yes, No, zero_gradient_only_certifies_stationarity)

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: d0e12d9102a389dda4e36c9d53d978eeaff698770061a3d6042c7a1b5ea20249
  • candidate record SHA-256: a606fe7e17f3e22728623b21d875142d85e1b88c9cf9cc2421c1cd66bdaf0e91
  • semantic review receipt SHA-256: 99b4f114b2ec93164b6aa5681e0107033a240e7a3f0a8988633ba65320ede267
  • question-first witness SHA-256: d9bd3a1940da8a73f790ee3fe460c9a8523791bdbe72c8e0304e3740b66710cc
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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