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Question 14551: Check the Parallelogram Identity in One Inner Product

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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R0028-14551 · q-20261014-advance-20261029-r03-inner-product-induced-norm-0076

Original question and givens

Use the same certified real inner product on R², <u,v>=u^T A v, with A=[[2, 0], [0, 1]] and x=[-3, -2]. The complete integer matrix must be symmetric with a positive leading entry and positive determinant. The induced norm is the nonnegative sqrt(<x,x>), with exact sqrt(...) text retained without simplification. Cauchy–Schwarz is a universal mathematical certificate, not proved by these vector instances or a new Lean receipt. Completeness and Hilbert structure are not inferred. y=[-5, 12]. Give (x,y,lhs=norm_square(x+y)+norm_square(x−y),rhs=2*norm_square(x)+2*norm_square(y),equal?).

  • G001 — Use the same certified real inner product on R², <u,v>=u^T A v, with A=[[2, 0], [0, 1]] and x=[-3, -2]. The complete integer matrix must be symmetric with a positive leading entry and positive determinant. The induced norm is the nonnegative sqrt(<x,x>), with exact sqrt(...) text retained without simplification. Cauchy–Schwarz is a universal mathematical certificate, not proved by these vector instances or a new Lean receipt. Completeness and Hilbert structure are not inferred. y=[-5, 12]. Give (x,y,lhs=norm_square(x+y)+norm_square(x−y),rhs=2*norm_square(x)+2*norm_square(y),equal?).

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

inner parent diagonal product := mul(2, 1)

After

inner parent diagonal product = 2

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001

S002 · calculation

Before

inner parent off-diagonal product := mul(0, 0)

After

inner parent off-diagonal product = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · calculation

Before

inner parent determinant := sub(2, 0)

After

inner parent determinant = 2

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S002

S004 · implies

Before

same real R2 inner-product candidate matrix=[[2, 0], [0, 1]]

After

symmetric=Yes;leading=2;determinant=2

Conditions: none

Qualify the same symmetric positive-definite real R² parent matrix,not an unrelated Euclidean or coordinate norm.Symmetry,positive leading entry and positive determinant are required.

Step identifiers and dependencies

Rule: innernorm_certified_same_SPD_parent · Uses: G001, S003

S005 · calculation

Before

inner parent completed-square slope := div(0, 2)

After

inner parent completed-square slope = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

inner parent completed-square remainder := div(2, 2)

After

inner parent completed-square remainder = 1

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · implies

Before

positive leading=2;slope=0;positive remainder=1

After

q(s,t)=(2)*(s+(0)*t)^2+(1)*t^2;positive iff(s,t)!=0

Conditions: none

The two positive completed-square coefficients give positive self-inner-product for every nonzero real vector and0 at zero,not merely sampled positive values.

Step identifiers and dependencies

Rule: innernorm_parent_global_positive_square_certificate · Uses: G001, S006

S008 · implies

Before

same certified real inner product;arbitrary real x,y

After

if y=0 then inner(x,y)=0;otherwise yy>0 and q(x-a*y)=xx-2*a*xy+a^2*yy>=0

Conditions: none

For every real a,self-inner-product is nonnegative.When y≠0,yy>0;choose a=xy/yy to obtain xx−xy²/yy≥0,multiply by positive yy to get xy²≤xx*yy.Handle y=0 separately without0/0.

Step identifiers and dependencies

Rule: innernorm_Cauchy_Schwarz_all_vectors_quadratic · Uses: G001, S007

S009 · implies

Before

norm(x)=nonnegative sqrt(inner(x,x));inner product positive definite and bilinear

After

norm(x)>=0;norm(x)=0 iff x=0;norm(a*x)=abs(a)*norm(x)

Conditions: none

Only the nonnegative root is the norm.From q(ax)=a²q(x),taking roots gives|a|,not a,including negative scalars.The zero and homogeneity claims are universal.

Step identifiers and dependencies

Rule: innernorm_nonnegative_root_and_absolute_homogeneity · Uses: G001, S008

S010 · implies

Before

Cauchy-Schwarz holds for arbitrary x,y in this same inner product

After

norm(x+y)^2=xx+2*xy+yy<=(norm(x)+norm(y))^2;nonnegative roots give triangle inequality

Conditions: none

Bound the cross term by|xy|≤norm(x)norm(y),then take nonnegative roots for the universal triangle inequality.One exact instance is not the theorem's source,and no completeness follows.

Step identifiers and dependencies

Rule: innernorm_triangle_uses_universal_Cauchy_Schwarz · Uses: G001, S009

S011 · implies

Before

x self-inner-product:same matrix=[[2, 0], [0, 1]];first vector=[-3, -2];second vector=[-3, -2]

After

inner product=first^T*(matrix*second)

Conditions: none

Use the same parent inner product:matrix times second slot,then dot with first.Derived rational vectors still belong to R² and are not clipped to raw integer input bounds.

Step identifiers and dependencies

Rule: innernorm_original_slot_roles · Uses: G001, S010

S012 · calculation

Before

x self-inner-product matrix term0,0 := mul(2, -3)

After

x self-inner-product matrix term0,0 = -6

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S011

S013 · calculation

Before

x self-inner-product matrix term0,1 := mul(0, -2)

After

x self-inner-product matrix term0,1 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S012

S014 · calculation

Before

x self-inner-product image coordinate0 := sum(-6, 0)

After

x self-inner-product image coordinate0 = -6

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S013

S015 · calculation

Before

x self-inner-product matrix term1,0 := mul(0, -3)

After

x self-inner-product matrix term1,0 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S014

S016 · calculation

Before

x self-inner-product matrix term1,1 := mul(1, -2)

After

x self-inner-product matrix term1,1 = -2

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S015

S017 · calculation

Before

x self-inner-product image coordinate1 := sum(0, -2)

After

x self-inner-product image coordinate1 = -2

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S016

S018 · calculation

Before

x self-inner-product first-slot term0 := mul(-3, -6)

After

x self-inner-product first-slot term0 = 18

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S017

S019 · calculation

Before

x self-inner-product first-slot term1 := mul(-2, -2)

After

x self-inner-product first-slot term1 = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S018

S020 · calculation

Before

x self-inner-product inner sum := sum(18, 4)

After

x self-inner-product inner sum = 22

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S019

S021 · implies

Before

y self-inner-product:same matrix=[[2, 0], [0, 1]];first vector=[-5, 12];second vector=[-5, 12]

After

inner product=first^T*(matrix*second)

Conditions: none

Use the same parent inner product:matrix times second slot,then dot with first.Derived rational vectors still belong to R² and are not clipped to raw integer input bounds.

Step identifiers and dependencies

Rule: innernorm_original_slot_roles · Uses: G001, S020

S022 · calculation

Before

y self-inner-product matrix term0,0 := mul(2, -5)

After

y self-inner-product matrix term0,0 = -10

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S021

S023 · calculation

Before

y self-inner-product matrix term0,1 := mul(0, 12)

After

y self-inner-product matrix term0,1 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S022

S024 · calculation

Before

y self-inner-product image coordinate0 := sum(-10, 0)

After

y self-inner-product image coordinate0 = -10

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S023

S025 · calculation

Before

y self-inner-product matrix term1,0 := mul(0, -5)

After

y self-inner-product matrix term1,0 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S024

S026 · calculation

Before

y self-inner-product matrix term1,1 := mul(1, 12)

After

y self-inner-product matrix term1,1 = 12

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S025

S027 · calculation

Before

y self-inner-product image coordinate1 := sum(0, 12)

After

y self-inner-product image coordinate1 = 12

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S026

S028 · calculation

Before

y self-inner-product first-slot term0 := mul(-5, -10)

After

y self-inner-product first-slot term0 = 50

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S027

S029 · calculation

Before

y self-inner-product first-slot term1 := mul(12, 12)

After

y self-inner-product first-slot term1 = 144

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S028

S030 · calculation

Before

y self-inner-product inner sum := sum(50, 144)

After

y self-inner-product inner sum = 194

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S029

S031 · calculation

Before

parallelogram sum coordinate0 := sum(-3, -5)

After

parallelogram sum coordinate0 = -8

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S030

S032 · calculation

Before

parallelogram sum coordinate1 := sum(-2, 12)

After

parallelogram sum coordinate1 = 10

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S031

S033 · calculation

Before

parallelogram difference coordinate0 := sub(-3, -5)

After

parallelogram difference coordinate0 = 2

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S032

S034 · calculation

Before

parallelogram difference coordinate1 := sub(-2, 12)

After

parallelogram difference coordinate1 = -14

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S033

S035 · implies

Before

sum self-inner-product:same matrix=[[2, 0], [0, 1]];first vector=[-8, 10];second vector=[-8, 10]

After

inner product=first^T*(matrix*second)

Conditions: none

Use the same parent inner product:matrix times second slot,then dot with first.Derived rational vectors still belong to R² and are not clipped to raw integer input bounds.

Step identifiers and dependencies

Rule: innernorm_original_slot_roles · Uses: G001, S034

S036 · calculation

Before

sum self-inner-product matrix term0,0 := mul(2, -8)

After

sum self-inner-product matrix term0,0 = -16

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S035

S037 · calculation

Before

sum self-inner-product matrix term0,1 := mul(0, 10)

After

sum self-inner-product matrix term0,1 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S036

S038 · calculation

Before

sum self-inner-product image coordinate0 := sum(-16, 0)

After

sum self-inner-product image coordinate0 = -16

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S037

S039 · calculation

Before

sum self-inner-product matrix term1,0 := mul(0, -8)

After

sum self-inner-product matrix term1,0 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S038

S040 · calculation

Before

sum self-inner-product matrix term1,1 := mul(1, 10)

After

sum self-inner-product matrix term1,1 = 10

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S039

S041 · calculation

Before

sum self-inner-product image coordinate1 := sum(0, 10)

After

sum self-inner-product image coordinate1 = 10

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S040

S042 · calculation

Before

sum self-inner-product first-slot term0 := mul(-8, -16)

After

sum self-inner-product first-slot term0 = 128

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S041

S043 · calculation

Before

sum self-inner-product first-slot term1 := mul(10, 10)

After

sum self-inner-product first-slot term1 = 100

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S042

S044 · calculation

Before

sum self-inner-product inner sum := sum(128, 100)

After

sum self-inner-product inner sum = 228

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S043

S045 · implies

Before

difference self-inner-product:same matrix=[[2, 0], [0, 1]];first vector=[2, -14];second vector=[2, -14]

After

inner product=first^T*(matrix*second)

Conditions: none

Use the same parent inner product:matrix times second slot,then dot with first.Derived rational vectors still belong to R² and are not clipped to raw integer input bounds.

Step identifiers and dependencies

Rule: innernorm_original_slot_roles · Uses: G001, S044

S046 · calculation

Before

difference self-inner-product matrix term0,0 := mul(2, 2)

After

difference self-inner-product matrix term0,0 = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S045

S047 · calculation

Before

difference self-inner-product matrix term0,1 := mul(0, -14)

After

difference self-inner-product matrix term0,1 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S046

S048 · calculation

Before

difference self-inner-product image coordinate0 := sum(4, 0)

After

difference self-inner-product image coordinate0 = 4

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S047

S049 · calculation

Before

difference self-inner-product matrix term1,0 := mul(0, 2)

After

difference self-inner-product matrix term1,0 = 0

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S048

S050 · calculation

Before

difference self-inner-product matrix term1,1 := mul(1, -14)

After

difference self-inner-product matrix term1,1 = -14

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S049

S051 · calculation

Before

difference self-inner-product image coordinate1 := sum(0, -14)

After

difference self-inner-product image coordinate1 = -14

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S050

S052 · calculation

Before

difference self-inner-product first-slot term0 := mul(2, 4)

After

difference self-inner-product first-slot term0 = 8

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S051

S053 · calculation

Before

difference self-inner-product first-slot term1 := mul(-14, -14)

After

difference self-inner-product first-slot term1 = 196

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S052

S054 · calculation

Before

difference self-inner-product inner sum := sum(8, 196)

After

difference self-inner-product inner sum = 204

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S053

S055 · calculation

Before

parallelogram left sum := sum(228, 204)

After

parallelogram left sum = 432

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S054

S056 · calculation

Before

twice x self-inner-product := mul(2, 22)

After

twice x self-inner-product = 44

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S055

S057 · calculation

Before

twice y self-inner-product := mul(2, 194)

After

twice y self-inner-product = 388

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S056

S058 · calculation

Before

parallelogram right sum := sum(44, 388)

After

parallelogram right sum = 432

Conditions: none

Compute exactly from original roles and established intermediates,retaining denominators,signs,indices and necessary guards.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S057

S059 · implies

Before

same inner product;left=432;right=432

After

bilinear expansions have opposite cross terms which cancel;identity=Yes

Conditions: none

Expand q(x+y),q(x−y);their opposite±2xy terms cancel to2q(x)+2q(y).This instance neither constructs an inner product by converse nor certifies Hilbert completeness.

Step identifiers and dependencies

Rule: parallelogram_same_form_identity_not_Hilbert_claim · Uses: G001, S058

Reverse checks

  • S059 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S058 · premise_and_result_audit — Recompute parallelogram right sum with exact rational arithmetic, not rounded decimals.
  • S057 · premise_and_result_audit — Recompute twice y self-inner-product with exact rational arithmetic, not rounded decimals.
  • S056 · premise_and_result_audit — Recompute twice x self-inner-product with exact rational arithmetic, not rounded decimals.
  • S055 · premise_and_result_audit — Recompute parallelogram left sum with exact rational arithmetic, not rounded decimals.
  • S054 · premise_and_result_audit — Recompute difference self-inner-product inner sum with exact rational arithmetic, not rounded decimals.
  • S053 · premise_and_result_audit — Recompute difference self-inner-product first-slot term1 with exact rational arithmetic, not rounded decimals.
  • S052 · premise_and_result_audit — Recompute difference self-inner-product first-slot term0 with exact rational arithmetic, not rounded decimals.
  • S051 · premise_and_result_audit — Recompute difference self-inner-product image coordinate1 with exact rational arithmetic, not rounded decimals.
  • S050 · premise_and_result_audit — Recompute difference self-inner-product matrix term1,1 with exact rational arithmetic, not rounded decimals.
  • S049 · premise_and_result_audit — Recompute difference self-inner-product matrix term1,0 with exact rational arithmetic, not rounded decimals.
  • S048 · premise_and_result_audit — Recompute difference self-inner-product image coordinate0 with exact rational arithmetic, not rounded decimals.
  • S047 · premise_and_result_audit — Recompute difference self-inner-product matrix term0,1 with exact rational arithmetic, not rounded decimals.
  • S046 · premise_and_result_audit — Recompute difference self-inner-product matrix term0,0 with exact rational arithmetic, not rounded decimals.
  • S045 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S044 · premise_and_result_audit — Recompute sum self-inner-product inner sum with exact rational arithmetic, not rounded decimals.
  • S043 · premise_and_result_audit — Recompute sum self-inner-product first-slot term1 with exact rational arithmetic, not rounded decimals.
  • S042 · premise_and_result_audit — Recompute sum self-inner-product first-slot term0 with exact rational arithmetic, not rounded decimals.
  • S041 · premise_and_result_audit — Recompute sum self-inner-product image coordinate1 with exact rational arithmetic, not rounded decimals.
  • S040 · premise_and_result_audit — Recompute sum self-inner-product matrix term1,1 with exact rational arithmetic, not rounded decimals.
  • S039 · premise_and_result_audit — Recompute sum self-inner-product matrix term1,0 with exact rational arithmetic, not rounded decimals.
  • S038 · premise_and_result_audit — Recompute sum self-inner-product image coordinate0 with exact rational arithmetic, not rounded decimals.
  • S037 · premise_and_result_audit — Recompute sum self-inner-product matrix term0,1 with exact rational arithmetic, not rounded decimals.
  • S036 · premise_and_result_audit — Recompute sum self-inner-product matrix term0,0 with exact rational arithmetic, not rounded decimals.
  • S035 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S034 · premise_and_result_audit — Recompute parallelogram difference coordinate1 with exact rational arithmetic, not rounded decimals.
  • S033 · premise_and_result_audit — Recompute parallelogram difference coordinate0 with exact rational arithmetic, not rounded decimals.
  • S032 · premise_and_result_audit — Recompute parallelogram sum coordinate1 with exact rational arithmetic, not rounded decimals.
  • S031 · premise_and_result_audit — Recompute parallelogram sum coordinate0 with exact rational arithmetic, not rounded decimals.
  • S030 · premise_and_result_audit — Recompute y self-inner-product inner sum with exact rational arithmetic, not rounded decimals.
  • S029 · premise_and_result_audit — Recompute y self-inner-product first-slot term1 with exact rational arithmetic, not rounded decimals.
  • S028 · premise_and_result_audit — Recompute y self-inner-product first-slot term0 with exact rational arithmetic, not rounded decimals.
  • S027 · premise_and_result_audit — Recompute y self-inner-product image coordinate1 with exact rational arithmetic, not rounded decimals.
  • S026 · premise_and_result_audit — Recompute y self-inner-product matrix term1,1 with exact rational arithmetic, not rounded decimals.
  • S025 · premise_and_result_audit — Recompute y self-inner-product matrix term1,0 with exact rational arithmetic, not rounded decimals.
  • S024 · premise_and_result_audit — Recompute y self-inner-product image coordinate0 with exact rational arithmetic, not rounded decimals.
  • S023 · premise_and_result_audit — Recompute y self-inner-product matrix term0,1 with exact rational arithmetic, not rounded decimals.
  • S022 · premise_and_result_audit — Recompute y self-inner-product matrix term0,0 with exact rational arithmetic, not rounded decimals.
  • S021 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S020 · premise_and_result_audit — Recompute x self-inner-product inner sum with exact rational arithmetic, not rounded decimals.
  • S019 · premise_and_result_audit — Recompute x self-inner-product first-slot term1 with exact rational arithmetic, not rounded decimals.
  • S018 · premise_and_result_audit — Recompute x self-inner-product first-slot term0 with exact rational arithmetic, not rounded decimals.
  • S017 · premise_and_result_audit — Recompute x self-inner-product image coordinate1 with exact rational arithmetic, not rounded decimals.
  • S016 · premise_and_result_audit — Recompute x self-inner-product matrix term1,1 with exact rational arithmetic, not rounded decimals.
  • S015 · premise_and_result_audit — Recompute x self-inner-product matrix term1,0 with exact rational arithmetic, not rounded decimals.
  • S014 · premise_and_result_audit — Recompute x self-inner-product image coordinate0 with exact rational arithmetic, not rounded decimals.
  • S013 · premise_and_result_audit — Recompute x self-inner-product matrix term0,1 with exact rational arithmetic, not rounded decimals.
  • S012 · premise_and_result_audit — Recompute x self-inner-product matrix term0,0 with exact rational arithmetic, not rounded decimals.
  • 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 — 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S006 · premise_and_result_audit — Recompute inner parent completed-square remainder with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute inner parent completed-square slope 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 inner parent determinant with exact rational arithmetic, not rounded decimals.
  • S002 · premise_and_result_audit — Recompute inner parent off-diagonal product with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Recompute inner parent diagonal product with exact rational arithmetic, not rounded decimals.

Result

([-3, -2], [-5, 12], 432, 432, 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: 7712c09e7d7ebf6c55f22f9b059dc51e59f523c67413de619560fa3d3b738c71
  • candidate record SHA-256: 50d1f00364758bd02d3e8b511774f544995e5176ecda8e2813f7d179fe730d25
  • semantic review receipt SHA-256: bfea39236e49aa7e44aa18bfa0d7857ff34a6acb762d0599e20b0f5af0f209ae
  • question-first witness SHA-256: 61c433f5c1e55ed4d84d08557fb8c117d26bbd404fdf05519ad42c09324c36e0
  • Lean: NOT_RUN · human review: NOT_PERFORMED
Same-source full JSON