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Question 21306: Complete Trial Division Produces the Canonical Prime Multiset

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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← Question derivation index · Original question batch

R0041-21306 · q-20261014-advance-20261108-r06-unique-prime-factorization-0031

Original question and givens

Use positive integer n=78>1. Give (n, prime_multiset, exponents, product, complete_factorization_certificate, certificate).

  • G001 — Use positive integer n=78>1. Give (n, prime_multiset, exponents, product, complete_factorization_certificate, 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=upf-canonical-factorization;original snapshot and mathematics retained

After

explicit ordered source output fields=[n, prime_multiset, exponents, product, complete_factorization_certificate, certificate]

Conditions: none

Retain the historical interface marker while listing ordered output fields without JavaScript.Fields and tags are not extra mathematical evidence;fixed No markers retain their claim scope.

Step identifiers and dependencies

Rule: source_ordered_interface_explicit_without_javascript · Uses: G001

S002 · implies

Before

ORIGINAL positive integer absolute magnitude=78>1

After

initialize remaining=n,prime multiset empty;invariant product(extracted)*remaining=n;every smaller trial divisor has been exhausted

Conditions: none

Divide only by an actual divisor and exhaust smaller candidates,which justifies primality of each extracted divisor without assuming n is prime.

Step identifiers and dependencies

Rule: upf_factorization_remaining_product_invariant · Uses: G001, S001

S003 · calculation

Before

upf extract divisor2 occurrence0 := div(78, 2)

After

upf extract divisor2 occurrence0 = 39

Conditions: none

Substitute the original roles and established intermediates exactly,retaining order,signs and quantified conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

next divisor=2;previous remaining=78;all smaller divisors exhausted

After

extracted multiplicity=1;next remaining=39;remaining modulo2=1;extracted multiset=[2]

Conditions: none

Exhaust every multiplicity before advancing.The stopping test concerns the current remainder,and the final prime remainder must not be omitted.

Step identifiers and dependencies

Rule: upf_complete_trial_division_remaining_invariant · Uses: G001, S003

S005 · calculation

Before

upf extract divisor3 occurrence1 := div(39, 3)

After

upf extract divisor3 occurrence1 = 13

Conditions: none

Substitute the original roles and established intermediates exactly,retaining order,signs and quantified conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · implies

Before

next divisor=3;previous remaining=39;all smaller divisors exhausted

After

extracted multiplicity=1;next remaining=13;remaining modulo3=1;extracted multiset=[2, 3]

Conditions: none

Exhaust every multiplicity before advancing.The stopping test concerns the current remainder,and the final prime remainder must not be omitted.

Step identifiers and dependencies

Rule: upf_complete_trial_division_remaining_invariant · Uses: G001, S005

S007 · calculation

Before

upf canonical complete product factor0 := mul(1, 2)

After

upf canonical complete product factor0 = 2

Conditions: none

Substitute the original roles and established intermediates exactly,retaining order,signs and quantified conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

upf canonical complete product factor1 := mul(2, 3)

After

upf canonical complete product factor1 = 6

Conditions: none

Substitute the original roles and established intermediates exactly,retaining order,signs and quantified conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · calculation

Before

upf canonical complete product factor2 := mul(6, 13)

After

upf canonical complete product factor2 = 78

Conditions: none

Substitute the original roles and established intermediates exactly,retaining order,signs and quantified conditions.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S008

S010 · implies

Before

exhausted trial divisors below4;terminal remaining=13;d*d>remaining;ORIGINAL n=78

After

complete increasing prime multiset=[2, 3, 13];full product=78;a composite terminal remainder would have an already tested smaller divisor

Conditions: none

If a terminal remainder greater than1 were composite,its least prime factor would already have been exhausted,a contradiction.The final entry is therefore prime.This certifies this instance;general existence follows by strong induction,recursively splitting a composite into smaller positive factors.

Step identifiers and dependencies

Rule: upf_final_prime_remainder_complete_existence_instance · Uses: G001, S009

S011 · implies

Before

ORIGINAL n=78;complete prime multiset=[2, 3, 13]

After

ALL [prime,exponent] rows=[[2, 1], [3, 1], [13, 1]];product=78;no multiplicities discarded

Conditions: none

Retain every multiplicity,not just distinct prime support.Uniqueness compares all exponents,not only which prime species occur.

Step identifiers and dependencies

Rule: upf_exponents_keep_every_prime_multiplicity · Uses: G001, S010

Reverse checks

  • S011 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S010 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S009 · premise_and_result_audit — Recompute upf canonical complete product factor2 with exact rational arithmetic, not rounded decimals.
  • S008 · premise_and_result_audit — Recompute upf canonical complete product factor1 with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute upf canonical complete product factor0 with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S005 · premise_and_result_audit — Recompute upf extract divisor3 occurrence1 with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S003 · premise_and_result_audit — Recompute upf extract divisor2 occurrence0 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

(78, [2, 3, 13], [[2, 1], [3, 1], [13, 1]], 78, Yes, complete_trial_division_range)

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: 259ef178854726b7e2ebc230020cc4aa3218582817f71a9649b5e8660a4599ea
  • candidate record SHA-256: ba014bd25775b9b5aa729723b8838aa7c9d7ebe1cfbe26dd29dfd9613362a5de
  • semantic review receipt SHA-256: 8f134403487694af4c70d2e00ec84bab542043ef4b3c54517c04f3c409c0262a
  • question-first witness SHA-256: ad772845088ed8e99f87f90d4264b05ea97be35775305a02011af5ee35f0f4ce
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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