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Question 23048: Order Zero Is the Original Function; Later Orders Need the Recursive Chain

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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R0045-23048 · q-20261014-advance-20261111-r02-higher-order-derivative-0023

Original question and givens

Use original low-to-high coefficients=[23, 46, 69, 92, 115, 138] for f(t)=sum coefficients[k]*t^k and derivative order=1≥0. f^(0)=f and each further order differentiates the preceding function. The declared degree bound is coefficient-list length minus1; trailing zeros would make it an upper bound rather than a minimal degree. Give (declared_degree_bound, order, nonnegative_order, order_convention, polynomial_chain_certificate).

  • G001 — Use original low-to-high coefficients=[23, 46, 69, 92, 115, 138] for f(t)=sum coefficients[k]*t^k and derivative order=1≥0. f^(0)=f and each further order differentiates the preceding function. The declared degree bound is coefficient-list length minus1; trailing zeros would make it an upper bound rather than a minimal degree. Give (declared_degree_bound, order, nonnegative_order, order_convention, polynomial_chain_certificate).

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=higher-order-qualification;original snapshot and mathematics retained

After

explicit ordered source output fields=[declared_degree_bound, order, nonnegative_order, order_convention, polynomial_chain_certificate]

Conditions: none

Retain the historical interface marker while listing source fields without JavaScript.Tags and No retain their claim scope;source-protocol ordering is not a mathematical proof.

Step identifiers and dependencies

Rule: source_ordered_interface_explicit_without_javascript · Uses: G001

S002 · implies

Before

ORIGINAL low-to-high coefficients=[23, 46, 69, 92, 115, 138];declared order=1

After

declared degree BOUND=5=ORIGINAL length-1;initialize derivative order0 with the UNTRIMMED original list

Conditions: none

Length minus1 is the declared bound;do not trim trailing zeros.Order0 is the original function.The monomial rule and finite sums justify each polynomial derivative,not an infinite extrapolation for arbitrary functions.

Step identifiers and dependencies

Rule: higher_ORIGINAL_low_to_high_coefficients_degree_BOUND_order0 · Uses: G001, S001

S003 · calculation

Before

Higher derivative level1 ORIGINAL power1 coefficient product := mul(46, 1)

After

Higher derivative level1 ORIGINAL power1 coefficient product = 46

Conditions: none

Substitute this question's original roles,order and established intermediates exactly,not floats or another question's data.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · calculation

Before

Higher derivative level1 ORIGINAL power2 coefficient product := mul(69, 2)

After

Higher derivative level1 ORIGINAL power2 coefficient product = 138

Conditions: none

Substitute this question's original roles,order and established intermediates exactly,not floats or another question's data.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · calculation

Before

Higher derivative level1 ORIGINAL power3 coefficient product := mul(92, 3)

After

Higher derivative level1 ORIGINAL power3 coefficient product = 276

Conditions: none

Substitute this question's original roles,order and established intermediates exactly,not floats or another question's data.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

Higher derivative level1 ORIGINAL power4 coefficient product := mul(115, 4)

After

Higher derivative level1 ORIGINAL power4 coefficient product = 460

Conditions: none

Substitute this question's original roles,order and established intermediates exactly,not floats or another question's data.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · calculation

Before

Higher derivative level1 ORIGINAL power5 coefficient product := mul(138, 5)

After

Higher derivative level1 ORIGINAL power5 coefficient product = 690

Conditions: none

Substitute this question's original roles,order and established intermediates exactly,not floats or another question's data.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · implies

Before

previous derivative order=0;actual low-to-high list=[23, 46, 69, 92, 115, 138];drop ONLY its constant term

After

ALL [old_power,old_coefficient,multiplier,new_coefficient] rows=[[1, 46, 1, 46], [2, 69, 2, 138], [3, 92, 3, 276], [4, 115, 4, 460], [5, 138, 5, 690]];next raw list=[46, 138, 276, 460, 690];all intermediate products SAFE

Conditions: none

At each level multiply the original coefficient by its old power k and place it at k−1 in low-to-high order.Once exhausted,the raw list stays empty and is normalized to[0] only at the end.The English source requires every intermediate product SAFE,not merely the final value.

Step identifiers and dependencies

Rule: higher_EVERY_recursive_derivative_level_not_reordered · Uses: G001, S007

S009 · implies

Before

ORIGINAL coefficients=[23, 46, 69, 92, 115, 138];order=1;declared degree bound=5

After

final derivative coefficients=[46, 138, 276, 460, 690];for each original power k>=order multiplier=k*(k-1)*...*(k-order+1);lower powers vanish

Conditions: none

Repeated differentiation gives the falling factorial in original coefficient order;orders above the declared bound vanish.This gives no analyticity claim for arbitrary differentiable functions and does not turn a trailing-zero bound into the minimal degree.

Step identifiers and dependencies

Rule: higher_falling_factorial_rule_all_orders_polynomial_only · Uses: G001, S008

Reverse checks

  • S009 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S008 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S007 · premise_and_result_audit — Recompute Higher derivative level1 ORIGINAL power5 coefficient product with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Recompute Higher derivative level1 ORIGINAL power4 coefficient product with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute Higher derivative level1 ORIGINAL power3 coefficient product with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Recompute Higher derivative level1 ORIGINAL power2 coefficient product with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Recompute Higher derivative level1 ORIGINAL power1 coefficient 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

(5, 1, Yes, recursive_derivative_chain_required, Yes)

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: ec1184102ea85b0db84dd2bbfa6dc5b9f65777e770319f8f4f47d51980dba354
  • candidate record SHA-256: a8da32777aff92196fe9ed4ea807cb736e64d28faa09a21ef49f7b6dbd06adf2
  • semantic review receipt SHA-256: 357d7ad7a6726b2a757558d3b9586a408ade06526cc023da093719c292704438
  • question-first witness SHA-256: 99cefe17e98c7a74321801cf72df6d02fc95b6a6b78aa335accb7e11ed467b2a
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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