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Question 15993: Changing Both Representatives Must Preserve Both Operations

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

R0030-15993 · q-20261014-advance-20261031-r04-finite-quotient-ring-0093

Original question and givens

Use the parent ring Z_20 with residues 0 through 19 and the proper two-sided ideal I of multiples of d=4, where 2≤d≤n and d divides n. Its cosets are residue classes modulo d, ordered by representatives 0 through d−1 with increasing members. The d=n zero ideal is allowed; d=1 gives I=R and is excluded by the project's 1≠0 convention. Retain parent arithmetic modulo n separately from the quotient class label modulo d. No field conclusion follows. Representatives a=1, b=3, a_prime=5, b_prime=7 must denote the same respective input cosets. Give ([a,b,a_prime,b_prime],addition_classes,multiplication_classes,addition_well_defined?,multiplication_well_defined?,quotient_operations_well_defined?).

  • G001 — Use the parent ring Z_20 with residues 0 through 19 and the proper two-sided ideal I of multiples of d=4, where 2≤d≤n and d divides n. Its cosets are residue classes modulo d, ordered by representatives 0 through d−1 with increasing members. The d=n zero ideal is allowed; d=1 gives I=R and is excluded by the project's 1≠0 convention. Retain parent arithmetic modulo n separately from the quotient class label modulo d. No field conclusion follows. Representatives a=1, b=3, a_prime=5, b_prime=7 must denote the same respective input cosets. Give ([a,b,a_prime,b_prime],addition_classes,multiplication_classes,addition_well_defined?,multiplication_well_defined?,quotient_operations_well_defined?).

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 · calculation

Before

quotient ring parent modulus divided by ideal generator := div(20, 4)

After

quotient ring parent modulus divided by ideal generator = 5

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001

S002 · implies

Before

same declared parent Z_20;generator d=4;n/d=5;ideal multiples=[0, 4, 8, 12, 16]

After

I=kernel of residue map Z_20 to Z_4;proper two-sided ideal=Yes;zero ideal allowed when d=n

Conditions: none

Since d divides n,changing an integer representative by n does not change mod d.The map π:Z_n→Z_d is well-defined and preserves addition and multiplication.Its kernel consists of multiples of d,closed under differences and multiplication on either side by parent elements.With d≥2 it excludes1 and is proper;d=n gives the allowed zero ideal.

Step identifiers and dependencies

Rule: quotient_ring_actual_parent_proper_two_sided_ideal · Uses: G001, S001

S003 · implies

Before

complete parent residues=[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19];same ideal I=[0, 4, 8, 12, 16]

After

all additive cosets in representative order0..d-1=[[0, 4, 8, 12, 16], [1, 5, 9, 13, 17], [2, 6, 10, 14, 18], [3, 7, 11, 15, 19]];quotient size=4;no field conclusion

Conditions: none

List every parent element congruent mod d in each additive coset,ordered by representatives0 through d−1.They are disjoint and cover Z_n.Quotient elements are whole cosets;class labels are indices only,and a finite quotient ring is not automatically a field.

Step identifiers and dependencies

Rule: quotient_ring_full_cosets_not_representative_carrier · Uses: G001, S002

S004 · calculation

Before

representative slot0 input class exact quotient fraction := div(1, 4)

After

representative slot0 input class exact quotient fraction = 1/4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · implies

Before

representative slot0 input class:integer value=1;positive modulus=4;exact ratio=1/4

After

floor quotient=0;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S004

S006 · calculation

Before

representative slot0 input class quotient multiple := mul(0, 4)

After

representative slot0 input class quotient multiple = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · calculation

Before

representative slot0 input class canonical nonnegative residue := sub(1, 0)

After

representative slot0 input class canonical nonnegative residue = 1

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

representative slot1 input class exact quotient fraction := div(3, 4)

After

representative slot1 input class exact quotient fraction = 3/4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · implies

Before

representative slot1 input class:integer value=3;positive modulus=4;exact ratio=3/4

After

floor quotient=0;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S008

S010 · calculation

Before

representative slot1 input class quotient multiple := mul(0, 4)

After

representative slot1 input class quotient multiple = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S009

S011 · calculation

Before

representative slot1 input class canonical nonnegative residue := sub(3, 0)

After

representative slot1 input class canonical nonnegative residue = 3

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S010

S012 · calculation

Before

representative slot2 input class exact quotient fraction := div(5, 4)

After

representative slot2 input class exact quotient fraction = 5/4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S011

S013 · implies

Before

representative slot2 input class:integer value=5;positive modulus=4;exact ratio=5/4

After

floor quotient=1;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S012

S014 · calculation

Before

representative slot2 input class quotient multiple := mul(1, 4)

After

representative slot2 input class quotient multiple = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S013

S015 · calculation

Before

representative slot2 input class canonical nonnegative residue := sub(5, 4)

After

representative slot2 input class canonical nonnegative residue = 1

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S014

S016 · calculation

Before

representative slot3 input class exact quotient fraction := div(7, 4)

After

representative slot3 input class exact quotient fraction = 7/4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S015

S017 · implies

Before

representative slot3 input class:integer value=7;positive modulus=4;exact ratio=7/4

After

floor quotient=1;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S016

S018 · calculation

Before

representative slot3 input class quotient multiple := mul(1, 4)

After

representative slot3 input class quotient multiple = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S017

S019 · calculation

Before

representative slot3 input class canonical nonnegative residue := sub(7, 4)

After

representative slot3 input class canonical nonnegative residue = 3

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S018

S020 · calculation

Before

first representative change := sub(1, 5)

After

first representative change = -4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S019

S021 · calculation

Before

second representative change := sub(3, 7)

After

second representative change = -4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S020

S022 · calculation

Before

first representative change divided by d := div(-4, 4)

After

first representative change divided by d = -1

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S021

S023 · calculation

Before

second representative change divided by d := div(-4, 4)

After

second representative change divided by d = -1

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S022

S024 · implies

Before

original representative choices=[1, 3, 5, 7];class labels in slot order=[1, 3, 1, 3];changes a-a_prime=-4;b-b_prime=-4

After

integer ideal multiples=[-1, -1];corresponding INPUT cosets agree

Conditions: none

First require the corresponding representatives to denote the same two input cosets.A mismatch is a failed premise,not a counterexample to well-definedness.Integer differences divided by d explicitly witness membership in the same ideal.

Step identifiers and dependencies

Rule: quotient_well_defined_input_cosets_are_premise · Uses: G001, S023

S025 · calculation

Before

representative choice0 addition integer addition := sum(1, 3)

After

representative choice0 addition integer addition = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S024

S026 · calculation

Before

representative choice0 addition parent mod n exact quotient fraction := div(4, 20)

After

representative choice0 addition parent mod n exact quotient fraction = 1/5

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S025

S027 · implies

Before

representative choice0 addition parent mod n:integer value=4;positive modulus=20;exact ratio=1/5

After

floor quotient=0;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S026

S028 · calculation

Before

representative choice0 addition parent mod n quotient multiple := mul(0, 20)

After

representative choice0 addition parent mod n quotient multiple = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S027

S029 · calculation

Before

representative choice0 addition parent mod n canonical nonnegative residue := sub(4, 0)

After

representative choice0 addition parent mod n canonical nonnegative residue = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S028

S030 · calculation

Before

representative choice0 addition quotient class mod d exact quotient fraction := div(4, 4)

After

representative choice0 addition quotient class mod d exact quotient fraction = 1

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S029

S031 · implies

Before

representative choice0 addition quotient class mod d:integer value=4;positive modulus=4;exact ratio=1

After

floor quotient=1;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S030

S032 · calculation

Before

representative choice0 addition quotient class mod d quotient multiple := mul(1, 4)

After

representative choice0 addition quotient class mod d quotient multiple = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S031

S033 · calculation

Before

representative choice0 addition quotient class mod d canonical nonnegative residue := sub(4, 4)

After

representative choice0 addition quotient class mod d canonical nonnegative residue = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S032

S034 · implies

Before

representative choice0 addition:original parent representatives=[1, 3];integer result=4;parent modulus=20

After

parent result=4;quotient class label=0;class modulus=4

Conditions: none

Operate in the specified parent modulo n,then take the quotient class modulo d.These fields can differ;do not conflate their residues or confuse a class label with its full coset.

Step identifiers and dependencies

Rule: quotient_operation_parent_result_separate_from_class · Uses: G001, S033

S035 · calculation

Before

representative choice0 multiplication integer multiplication := mul(1, 3)

After

representative choice0 multiplication integer multiplication = 3

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S034

S036 · calculation

Before

representative choice0 multiplication parent mod n exact quotient fraction := div(3, 20)

After

representative choice0 multiplication parent mod n exact quotient fraction = 3/20

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S035

S037 · implies

Before

representative choice0 multiplication parent mod n:integer value=3;positive modulus=20;exact ratio=3/20

After

floor quotient=0;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S036

S038 · calculation

Before

representative choice0 multiplication parent mod n quotient multiple := mul(0, 20)

After

representative choice0 multiplication parent mod n quotient multiple = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S037

S039 · calculation

Before

representative choice0 multiplication parent mod n canonical nonnegative residue := sub(3, 0)

After

representative choice0 multiplication parent mod n canonical nonnegative residue = 3

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S038

S040 · calculation

Before

representative choice0 multiplication quotient class mod d exact quotient fraction := div(3, 4)

After

representative choice0 multiplication quotient class mod d exact quotient fraction = 3/4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S039

S041 · implies

Before

representative choice0 multiplication quotient class mod d:integer value=3;positive modulus=4;exact ratio=3/4

After

floor quotient=0;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S040

S042 · calculation

Before

representative choice0 multiplication quotient class mod d quotient multiple := mul(0, 4)

After

representative choice0 multiplication quotient class mod d quotient multiple = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S041

S043 · calculation

Before

representative choice0 multiplication quotient class mod d canonical nonnegative residue := sub(3, 0)

After

representative choice0 multiplication quotient class mod d canonical nonnegative residue = 3

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S042

S044 · implies

Before

representative choice0 multiplication:original parent representatives=[1, 3];integer result=3;parent modulus=20

After

parent result=3;quotient class label=3;class modulus=4

Conditions: none

Operate in the specified parent modulo n,then take the quotient class modulo d.These fields can differ;do not conflate their residues or confuse a class label with its full coset.

Step identifiers and dependencies

Rule: quotient_operation_parent_result_separate_from_class · Uses: G001, S043

S045 · calculation

Before

representative choice1 addition integer addition := sum(5, 7)

After

representative choice1 addition integer addition = 12

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S044

S046 · calculation

Before

representative choice1 addition parent mod n exact quotient fraction := div(12, 20)

After

representative choice1 addition parent mod n exact quotient fraction = 3/5

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S045

S047 · implies

Before

representative choice1 addition parent mod n:integer value=12;positive modulus=20;exact ratio=3/5

After

floor quotient=0;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S046

S048 · calculation

Before

representative choice1 addition parent mod n quotient multiple := mul(0, 20)

After

representative choice1 addition parent mod n quotient multiple = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S047

S049 · calculation

Before

representative choice1 addition parent mod n canonical nonnegative residue := sub(12, 0)

After

representative choice1 addition parent mod n canonical nonnegative residue = 12

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S048

S050 · calculation

Before

representative choice1 addition quotient class mod d exact quotient fraction := div(12, 4)

After

representative choice1 addition quotient class mod d exact quotient fraction = 3

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S049

S051 · implies

Before

representative choice1 addition quotient class mod d:integer value=12;positive modulus=4;exact ratio=3

After

floor quotient=3;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S050

S052 · calculation

Before

representative choice1 addition quotient class mod d quotient multiple := mul(3, 4)

After

representative choice1 addition quotient class mod d quotient multiple = 12

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S051

S053 · calculation

Before

representative choice1 addition quotient class mod d canonical nonnegative residue := sub(12, 12)

After

representative choice1 addition quotient class mod d canonical nonnegative residue = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S052

S054 · implies

Before

representative choice1 addition:original parent representatives=[5, 7];integer result=12;parent modulus=20

After

parent result=12;quotient class label=0;class modulus=4

Conditions: none

Operate in the specified parent modulo n,then take the quotient class modulo d.These fields can differ;do not conflate their residues or confuse a class label with its full coset.

Step identifiers and dependencies

Rule: quotient_operation_parent_result_separate_from_class · Uses: G001, S053

S055 · calculation

Before

representative choice1 multiplication integer multiplication := mul(5, 7)

After

representative choice1 multiplication integer multiplication = 35

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S054

S056 · calculation

Before

representative choice1 multiplication parent mod n exact quotient fraction := div(35, 20)

After

representative choice1 multiplication parent mod n exact quotient fraction = 7/4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S055

S057 · implies

Before

representative choice1 multiplication parent mod n:integer value=35;positive modulus=20;exact ratio=7/4

After

floor quotient=1;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S056

S058 · calculation

Before

representative choice1 multiplication parent mod n quotient multiple := mul(1, 20)

After

representative choice1 multiplication parent mod n quotient multiple = 20

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S057

S059 · calculation

Before

representative choice1 multiplication parent mod n canonical nonnegative residue := sub(35, 20)

After

representative choice1 multiplication parent mod n canonical nonnegative residue = 15

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S058

S060 · calculation

Before

representative choice1 multiplication quotient class mod d exact quotient fraction := div(15, 4)

After

representative choice1 multiplication quotient class mod d exact quotient fraction = 15/4

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S059

S061 · implies

Before

representative choice1 multiplication quotient class mod d:integer value=15;positive modulus=4;exact ratio=15/4

After

floor quotient=3;quotient<=ratio<quotient+1

Conditions: none

Take the exact rational quotient and its floor q,not the rational division result as a residue.With positive modulus,q≤value/m<q+1,so subtraction of qm yields a residue from0 through m−1.

Step identifiers and dependencies

Rule: modular_Euclidean_floor_not_rational_division_result · Uses: G001, S060

S062 · calculation

Before

representative choice1 multiplication quotient class mod d quotient multiple := mul(3, 4)

After

representative choice1 multiplication quotient class mod d quotient multiple = 12

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S061

S063 · calculation

Before

representative choice1 multiplication quotient class mod d canonical nonnegative residue := sub(15, 12)

After

representative choice1 multiplication quotient class mod d canonical nonnegative residue = 3

Conditions: none

Compute exactly from original roles and established intermediates,retaining indices,signs,denominators and the operation's carrier.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S062

S064 · implies

Before

representative choice1 multiplication:original parent representatives=[5, 7];integer result=35;parent modulus=20

After

parent result=15;quotient class label=3;class modulus=4

Conditions: none

Operate in the specified parent modulo n,then take the quotient class modulo d.These fields can differ;do not conflate their residues or confuse a class label with its full coset.

Step identifiers and dependencies

Rule: quotient_operation_parent_result_separate_from_class · Uses: G001, S063

S065 · implies

Before

ANY changes a-a_prime,b-b_prime in same two-sided ideal I;actual addition classes=[0, 0];actual multiplication classes=[3, 3]

After

(a+b)-(a_prime+b_prime)=(a-a_prime)+(b-b_prime) in I;ab-a_prime*b_prime=a*(b-b_prime)+(a-a_prime)*b_prime in I;both universal operation obligations=Yes

Conditions: none

Closure of I handles the additive difference;left/right absorption and addition handle the multiplicative difference.Thus any legal representative changes preserve both cosets.The two recomputations instantiate the result;universal well-definedness comes from this ideal argument,not merely two matching samples.

Step identifiers and dependencies

Rule: quotient_ring_universal_representative_independence_not_two_samples · Uses: G001, S064

Reverse checks

  • S065 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S064 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S063 · premise_and_result_audit — Recompute representative choice1 multiplication quotient class mod d canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S062 · premise_and_result_audit — Recompute representative choice1 multiplication quotient class mod d quotient multiple with exact rational arithmetic, not rounded decimals.
  • S061 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S060 · premise_and_result_audit — Recompute representative choice1 multiplication quotient class mod d exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S059 · premise_and_result_audit — Recompute representative choice1 multiplication parent mod n canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S058 · premise_and_result_audit — Recompute representative choice1 multiplication parent mod n quotient multiple with exact rational arithmetic, not rounded decimals.
  • S057 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S056 · premise_and_result_audit — Recompute representative choice1 multiplication parent mod n exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S055 · premise_and_result_audit — Recompute representative choice1 multiplication integer multiplication with exact rational arithmetic, not rounded decimals.
  • S054 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S053 · premise_and_result_audit — Recompute representative choice1 addition quotient class mod d canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S052 · premise_and_result_audit — Recompute representative choice1 addition quotient class mod d quotient multiple with exact rational arithmetic, not rounded decimals.
  • S051 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S050 · premise_and_result_audit — Recompute representative choice1 addition quotient class mod d exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S049 · premise_and_result_audit — Recompute representative choice1 addition parent mod n canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S048 · premise_and_result_audit — Recompute representative choice1 addition parent mod n quotient multiple with exact rational arithmetic, not rounded decimals.
  • S047 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S046 · premise_and_result_audit — Recompute representative choice1 addition parent mod n exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S045 · premise_and_result_audit — Recompute representative choice1 addition integer addition with exact rational arithmetic, not rounded decimals.
  • S044 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S043 · premise_and_result_audit — Recompute representative choice0 multiplication quotient class mod d canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S042 · premise_and_result_audit — Recompute representative choice0 multiplication quotient class mod d quotient multiple with exact rational arithmetic, not rounded decimals.
  • S041 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S040 · premise_and_result_audit — Recompute representative choice0 multiplication quotient class mod d exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S039 · premise_and_result_audit — Recompute representative choice0 multiplication parent mod n canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S038 · premise_and_result_audit — Recompute representative choice0 multiplication parent mod n quotient multiple with exact rational arithmetic, not rounded decimals.
  • S037 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S036 · premise_and_result_audit — Recompute representative choice0 multiplication parent mod n exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S035 · premise_and_result_audit — Recompute representative choice0 multiplication integer multiplication with exact rational arithmetic, not rounded decimals.
  • S034 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S033 · premise_and_result_audit — Recompute representative choice0 addition quotient class mod d canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S032 · premise_and_result_audit — Recompute representative choice0 addition quotient class mod d quotient multiple with exact rational arithmetic, not rounded decimals.
  • S031 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S030 · premise_and_result_audit — Recompute representative choice0 addition quotient class mod d exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S029 · premise_and_result_audit — Recompute representative choice0 addition parent mod n canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S028 · premise_and_result_audit — Recompute representative choice0 addition parent mod n quotient multiple with exact rational arithmetic, not rounded decimals.
  • S027 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S026 · premise_and_result_audit — Recompute representative choice0 addition parent mod n exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S025 · premise_and_result_audit — Recompute representative choice0 addition integer addition with exact rational arithmetic, not rounded decimals.
  • S024 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S023 · premise_and_result_audit — Recompute second representative change divided by d with exact rational arithmetic, not rounded decimals.
  • S022 · premise_and_result_audit — Recompute first representative change divided by d with exact rational arithmetic, not rounded decimals.
  • S021 · premise_and_result_audit — Recompute second representative change with exact rational arithmetic, not rounded decimals.
  • S020 · premise_and_result_audit — Recompute first representative change with exact rational arithmetic, not rounded decimals.
  • S019 · premise_and_result_audit — Recompute representative slot3 input class canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S018 · premise_and_result_audit — Recompute representative slot3 input class quotient multiple with exact rational arithmetic, not rounded decimals.
  • S017 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S016 · premise_and_result_audit — Recompute representative slot3 input class exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S015 · premise_and_result_audit — Recompute representative slot2 input class canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S014 · premise_and_result_audit — Recompute representative slot2 input class quotient multiple with exact rational arithmetic, not rounded decimals.
  • S013 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S012 · premise_and_result_audit — Recompute representative slot2 input class exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S011 · premise_and_result_audit — Recompute representative slot1 input class canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S010 · premise_and_result_audit — Recompute representative slot1 input class quotient multiple with exact rational arithmetic, not rounded decimals.
  • 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 — Recompute representative slot1 input class exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute representative slot0 input class canonical nonnegative residue with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Recompute representative slot0 input class quotient multiple with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S004 · premise_and_result_audit — Recompute representative slot0 input class exact quotient fraction with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • 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 — Recompute quotient ring parent modulus divided by ideal generator with exact rational arithmetic, not rounded decimals.

Result

([1, 3, 5, 7], [0, 0], [3, 3], Yes, Yes, 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: 165119cdd12c87af7d0300e31200e827c616524c81ae4152371a9140dd9a3954
  • candidate record SHA-256: 31a6f04451dac42aa0bf49986fc1e874b0bb8be2b9d0a77cd6ed307a64bd05fb
  • semantic review receipt SHA-256: 73bc08066ffb1a81eacb2d4e288d03f522aeefd3949fa0d97da41b484ed737bc
  • question-first witness SHA-256: ac120452a208b257b8270f38351a09dcd832cdbc8d9db6b69933f83e43cc9336
  • Lean: NOT_RUN · human review: NOT_PERFORMED
Same-source full JSON