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Question 31788: Exact Euclidean Remainder Trace and Natural GCD

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

R0062-31788 · q-20261013-advance-20261018-r03-gcd-coprime-0013

Original question and givens

Use natural gcd with a=119, b=72. Give (a, b, ordered Euclid rows [x,y,x mod y] while y≠0, final gcd). Adopt gcd(0,0)=0.

  • G001 — Use natural gcd with a=119, b=72. Give (a, b, ordered Euclid rows [x,y,x mod y] while y≠0, final gcd). Adopt gcd(0,0)=0.

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-ext18-gcd-euclid-trace, Nat_gcd, gcd-euclid-trace, no-form-field]

After

derived = [[a, b, ordered_Euclid_rows, gcd]]

Conditions: none

Check THIS bank interface:BASE equations use form/domain;BASE events/complement have no operation;factorials have no domain.ext18 uses local hyphens,other legacy operations underscores.Do not force every answer into a tuple or fraction.

Step identifiers and dependencies

Rule: R62_EXACT_source_keys_domain_operation_form_AND_output_types · Uses: G001

S002 · calculation

Before

GCD Euclid row0 ORIGINAL quotient times y := mul(1, 72)

After

GCD Euclid row0 ORIGINAL quotient times y = 72

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · calculation

Before

GCD Euclid row0 ORIGINAL x minus qy := sub(119, 72)

After

GCD Euclid row0 ORIGINAL x minus qy = 47

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

source roles = [119, 72, 1]

After

derived = [72, 47, [119, 72, 47]]

Conditions: none

With y≠0,divide to get x=qy+r and0≤r<y.A divisor common to x,y divides y,r,and the converse follows from x=qy+r,so common divisors are unchanged.Positive remainders strictly decrease,ensuring termination.

Step identifiers and dependencies

Rule: GCD_EUCLID_nonzero_divisor_exact_quotient_remainder_INVARIANT · Uses: G001, S003

S005 · calculation

Before

GCD Euclid row1 ORIGINAL quotient times y := mul(1, 47)

After

GCD Euclid row1 ORIGINAL quotient times y = 47

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

GCD Euclid row1 ORIGINAL x minus qy := sub(72, 47)

After

GCD Euclid row1 ORIGINAL x minus qy = 25

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · implies

Before

source roles = [72, 47, 1]

After

derived = [47, 25, [72, 47, 25]]

Conditions: none

With y≠0,divide to get x=qy+r and0≤r<y.A divisor common to x,y divides y,r,and the converse follows from x=qy+r,so common divisors are unchanged.Positive remainders strictly decrease,ensuring termination.

Step identifiers and dependencies

Rule: GCD_EUCLID_nonzero_divisor_exact_quotient_remainder_INVARIANT · Uses: G001, S006

S008 · calculation

Before

GCD Euclid row2 ORIGINAL quotient times y := mul(1, 25)

After

GCD Euclid row2 ORIGINAL quotient times y = 25

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · calculation

Before

GCD Euclid row2 ORIGINAL x minus qy := sub(47, 25)

After

GCD Euclid row2 ORIGINAL x minus qy = 22

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S008

S010 · implies

Before

source roles = [47, 25, 1]

After

derived = [25, 22, [47, 25, 22]]

Conditions: none

With y≠0,divide to get x=qy+r and0≤r<y.A divisor common to x,y divides y,r,and the converse follows from x=qy+r,so common divisors are unchanged.Positive remainders strictly decrease,ensuring termination.

Step identifiers and dependencies

Rule: GCD_EUCLID_nonzero_divisor_exact_quotient_remainder_INVARIANT · Uses: G001, S009

S011 · calculation

Before

GCD Euclid row3 ORIGINAL quotient times y := mul(1, 22)

After

GCD Euclid row3 ORIGINAL quotient times y = 22

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S010

S012 · calculation

Before

GCD Euclid row3 ORIGINAL x minus qy := sub(25, 22)

After

GCD Euclid row3 ORIGINAL x minus qy = 3

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S011

S013 · implies

Before

source roles = [25, 22, 1]

After

derived = [22, 3, [25, 22, 3]]

Conditions: none

With y≠0,divide to get x=qy+r and0≤r<y.A divisor common to x,y divides y,r,and the converse follows from x=qy+r,so common divisors are unchanged.Positive remainders strictly decrease,ensuring termination.

Step identifiers and dependencies

Rule: GCD_EUCLID_nonzero_divisor_exact_quotient_remainder_INVARIANT · Uses: G001, S012

S014 · calculation

Before

GCD Euclid row4 ORIGINAL quotient times y := mul(7, 3)

After

GCD Euclid row4 ORIGINAL quotient times y = 21

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S013

S015 · calculation

Before

GCD Euclid row4 ORIGINAL x minus qy := sub(22, 21)

After

GCD Euclid row4 ORIGINAL x minus qy = 1

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S014

S016 · implies

Before

source roles = [22, 3, 7]

After

derived = [21, 1, [22, 3, 1]]

Conditions: none

With y≠0,divide to get x=qy+r and0≤r<y.A divisor common to x,y divides y,r,and the converse follows from x=qy+r,so common divisors are unchanged.Positive remainders strictly decrease,ensuring termination.

Step identifiers and dependencies

Rule: GCD_EUCLID_nonzero_divisor_exact_quotient_remainder_INVARIANT · Uses: G001, S015

S017 · calculation

Before

GCD Euclid row5 ORIGINAL quotient times y := mul(3, 1)

After

GCD Euclid row5 ORIGINAL quotient times y = 3

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S016

S018 · calculation

Before

GCD Euclid row5 ORIGINAL x minus qy := sub(3, 3)

After

GCD Euclid row5 ORIGINAL x minus qy = 0

Conditions: none

Use ORIGINAL operands and declared order for exact integer/rational arithmetic,not floats.Bounds are family-specific:do not revalidate derived values as RAW inputs or add blanket SAFE/n64 caps to BASE families.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S017

S019 · implies

Before

source roles = [3, 1, 3]

After

derived = [3, 0, [3, 1, 0]]

Conditions: none

With y≠0,divide to get x=qy+r and0≤r<y.A divisor common to x,y divides y,r,and the converse follows from x=qy+r,so common divisors are unchanged.Positive remainders strictly decrease,ensuring termination.

Step identifiers and dependencies

Rule: GCD_EUCLID_nonzero_divisor_exact_quotient_remainder_INVARIANT · Uses: G001, S018

S020 · implies

Before

source roles = [119, 72, [[119, 72, 47], [72, 47, 25], [47, 25, 22], [25, 22, 3], [22, 3, 1], [3, 1, 0]]]

After

derived = [1, 0]

Conditions: none

At second value0 retain the last x.For nonzero x,gcd(x,0)=x;the two-way common-divisor invariant transfers this to the original pair.At(0,0)use the EXPLICIT convention gcd=0,not a claim that0 is the largest positive divisor.

Step identifiers and dependencies

Rule: GCD_TERMINAL_last_x_ZEROsecond_and_explicit_gcd00_convention · Uses: G001, S019

Reverse checks

  • S020 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S019 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S018 · premise_and_result_audit — Recompute GCD Euclid row5 ORIGINAL x minus qy with exact rational arithmetic, not rounded decimals.
  • S017 · premise_and_result_audit — Recompute GCD Euclid row5 ORIGINAL quotient times y with exact rational arithmetic, not rounded decimals.
  • S016 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S015 · premise_and_result_audit — Recompute GCD Euclid row4 ORIGINAL x minus qy with exact rational arithmetic, not rounded decimals.
  • S014 · premise_and_result_audit — Recompute GCD Euclid row4 ORIGINAL quotient times y with exact rational arithmetic, not rounded decimals.
  • S013 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S012 · premise_and_result_audit — Recompute GCD Euclid row3 ORIGINAL x minus qy with exact rational arithmetic, not rounded decimals.
  • S011 · premise_and_result_audit — Recompute GCD Euclid row3 ORIGINAL quotient times y with exact rational arithmetic, not rounded decimals.
  • S010 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S009 · premise_and_result_audit — Recompute GCD Euclid row2 ORIGINAL x minus qy with exact rational arithmetic, not rounded decimals.
  • S008 · premise_and_result_audit — Recompute GCD Euclid row2 ORIGINAL quotient times y with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S006 · premise_and_result_audit — Recompute GCD Euclid row1 ORIGINAL x minus qy with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute GCD Euclid row1 ORIGINAL quotient times y with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.
  • S003 · premise_and_result_audit — Recompute GCD Euclid row0 ORIGINAL x minus qy with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Recompute GCD Euclid row0 ORIGINAL quotient times y with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,field roles,domain and premises.Consistency does not imply unique recovery of premises.Keep finite checking,independent review,formal proof and publication separate.

Result

(119, 72, [[119, 72, 47], [72, 47, 25], [47, 25, 22], [25, 22, 3], [22, 3, 1], [3, 1, 0]], 1)

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: 03c2067320059c5e40163021019a01b1e78923316ac0d3789ee95f9e3dbd642b
  • candidate record SHA-256: be2745d7487dbaa7da0afd9e2d9880c5da22de1027aa656b38b2760a5f0a0aef
  • semantic review receipt SHA-256: 963099ffc9f754069fdce6792949a85ed350472465eaceb3038fa8011cf672bd
  • question-first witness SHA-256: d7655324c5d11528e1af90b757384cebd3313e19dc5f6f5b9b8ea7624fb06f6f
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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