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Question 18774: A Covector Evaluates a Vector but Is Not That Vector

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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R0036-18774 · q-20261014-advance-20261105-r02-dual-vector-space-0024

Original question and givens

Use row coefficients=[24, -1] and primal vector=[2, 26] in one fixed coordinate basis. Coordinates are exact rationals, written as integers or [numerator, denominator] pairs with nonzero denominator. Give (coefficients, vector, value, boundary).

  • G001 — Use row coefficients=[24, -1] and primal vector=[2, 26] in one fixed coordinate basis. Coordinates are exact rationals, written as integers or [numerator, denominator] pairs with nonzero denominator. Give (coefficients, vector, value, 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=dual-functional-evaluation;original snapshot and mathematics retained

After

explicit ordered source output fields=[coefficients, vector, value, boundary]

Conditions: none

Keep the historical interface marker in the original snapshot while listing the original ordered fields here.No JavaScript or external table is needed for the main text,and field labels are not mathematical evidence.

Step identifiers and dependencies

Rule: source_ordered_interface_explicit_without_javascript · Uses: G001

S002 · implies

Before

fixed original covector ROW=[24, -1];coordinate dimension=2

After

define phi(x)=sum_j row[j]*x[j] for EVERY real coordinate vector x;finite distributivity gives phi(alpha*u+beta*v)=alpha*phi(u)+beta*phi(v)

Conditions: none

Finite distributivity for a fixed row holds for arbitrary real u,v,alpha,beta and gives the universal linearity certificate.The subsequent substitution checks this instance,not linearity of an unspecified function from one passing test.The row represents a real-valued function,not the primal vector itself.

Step identifiers and dependencies

Rule: dual_row_symbolic_universal_linearity_not_one_numeric_test · Uses: G001, S001

S003 · calculation

Before

dual functional original evaluation coordinate0 product := mul(24, 2)

After

dual functional original evaluation coordinate0 product = 48

Conditions: none

Substitute original data and established intermediates exactly,retaining indices,signs and the relevant space.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

dual functional original evaluation coordinate1 product := mul(-1, 26)

After

dual functional original evaluation coordinate1 product = -26

Conditions: none

Substitute original data and established intermediates exactly,retaining indices,signs and the relevant space.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · calculation

Before

dual functional original evaluation complete sum := sum(48, -26)

After

dual functional original evaluation complete sum = 22

Conditions: none

Substitute original data and established intermediates exactly,retaining indices,signs and the relevant space.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

Reverse checks

  • S005 · premise_and_result_audit — Recompute dual functional original evaluation complete sum with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Recompute dual functional original evaluation coordinate1 product with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute dual functional original evaluation coordinate0 product with exact rational arithmetic, not rounded decimals.
  • 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

([24, -1], [2, 26], 22, linear_functional_not_primal_vector)

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: c9dfe98c4fcef8dec46014cec043f6341681b4c7045e67357b12af50a2829ed3
  • candidate record SHA-256: 4418d14bebe318c468037100cf7a3373f819d254c69cecf96fa583f9f888dd66
  • semantic review receipt SHA-256: efee5462991619d6ed9f64f11ddb085e5614ef33f9f8fcd8cf29b9329f8fd301
  • question-first witness SHA-256: acf91fa1622f01d2cf04b2c513294254323665351f660f2628aaafdb869c4ff2
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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