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Question 33109: Addition of Equal-Size Matrices

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

R0065-33109 · q-20261006-advance-20261007-r01-matrix-0059

Original question and givens

Over R, A=[[-4, -5, -6, -7], [-2, -3, -4, -5]] and B=[[-5, -3, -1, 1], [-4, -2, 0, 2]] have the same dimensions. Find A+B as a nested list of rows.

  • G001 — Over R, A=[[-4, -5, -6, -7], [-2, -3, -4, -5]] and B=[[-5, -3, -1, 1], [-4, -2, 0, 2]] have the same dimensions. Find A+B as a nested list of rows.

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-matrix-addition, matrix_addition, reals, []]

After

derived = [[nested_ROW_matrix]]

Conditions: none

MOD25 uses LOCAL hyphens/named domains,legacy matrices underscores/reals;BASE logic acquires no domain/op.Output tuples,matrices,numeric fields and fraction texts follow THIS source,not a universal/1 rule.Retain originals/English/AST/status.

Step identifiers and dependencies

Rule: R65_SOURCE_bank_keys_operation_domain_ordered_output_roles · Uses: G001

S002 · implies

Before

source roles = [A ORIGINAL, [[-4, -5, -6, -7], [-2, -3, -4, -5]]]

After

derived = [2, 4]

Conditions: none

THIS bank allows1..5 by1..5 matrices,not the R64 2×2 restriction.Type EVERY raw SAFE cell,including unused shape/entry cells.Keep original row order.

Step identifiers and dependencies

Rule: Matrix_RAW_rectangular_1to5_ALL_SAFE_entries_even_unused · Uses: G001, S001

S003 · implies

Before

source roles = [B ORIGINAL, [[-5, -3, -1, 1], [-4, -2, 0, 2]]]

After

derived = [2, 4]

Conditions: none

THIS bank allows1..5 by1..5 matrices,not the R64 2×2 restriction.Type EVERY raw SAFE cell,including unused shape/entry cells.Keep original row order.

Step identifiers and dependencies

Rule: Matrix_RAW_rectangular_1to5_ALL_SAFE_entries_even_unused · Uses: G001, S002

S004 · calculation

Before

Matrix sum ORIGINAL entry0,0 := sum(-4, -5)

After

Matrix sum ORIGINAL entry0,0 = -9

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · calculation

Before

Matrix sum ORIGINAL entry0,1 := sum(-5, -3)

After

Matrix sum ORIGINAL entry0,1 = -8

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S004

S006 · calculation

Before

Matrix sum ORIGINAL entry0,2 := sum(-6, -1)

After

Matrix sum ORIGINAL entry0,2 = -7

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S005

S007 · calculation

Before

Matrix sum ORIGINAL entry0,3 := sum(-7, 1)

After

Matrix sum ORIGINAL entry0,3 = -6

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S006

S008 · calculation

Before

Matrix sum ORIGINAL entry1,0 := sum(-2, -4)

After

Matrix sum ORIGINAL entry1,0 = -6

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S007

S009 · calculation

Before

Matrix sum ORIGINAL entry1,1 := sum(-3, -2)

After

Matrix sum ORIGINAL entry1,1 = -5

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S008

S010 · calculation

Before

Matrix sum ORIGINAL entry1,2 := sum(-4, 0)

After

Matrix sum ORIGINAL entry1,2 = -4

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S009

S011 · calculation

Before

Matrix sum ORIGINAL entry1,3 := sum(-5, 2)

After

Matrix sum ORIGINAL entry1,3 = -3

Conditions: none

Use ORIGINAL operands/order for exact arithmetic.Rational operations separately enforce this MOD25 SOURCE pre-reduction envelope.Do not globally cap every derived integer at one million or use floating approximations.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S010

S012 · implies

Before

source roles = [[[-4, -5, -6, -7], [-2, -3, -4, -5]], [[-5, -3, -1, 1], [-4, -2, 0, 2]]]

After

derived = [[[-9, -8, -7, -6], [-6, -5, -4, -3]]]

Conditions: none

Add EVERY corresponding entry ONLY at equal shapes.Derived sums may exceed SAFE;do not reparse as a RAW matrix.No zero-padding or broadcasting.

Step identifiers and dependencies

Rule: Matrix_ADDITION_all_corresponding_entries_NO_padding_or_raw_recap · Uses: G001, S011

Reverse checks

  • S012 · premise_and_result_audit — Reverse-check ORIGINAL data,types,ordered roles,domain and premises;the conclusion need not uniquely recover its premises.Keep finite source candidates,independent review,formal proof and publication separate.
  • S011 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry1,3 with exact rational arithmetic, not rounded decimals.
  • S010 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry1,2 with exact rational arithmetic, not rounded decimals.
  • S009 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry1,1 with exact rational arithmetic, not rounded decimals.
  • S008 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry1,0 with exact rational arithmetic, not rounded decimals.
  • S007 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry0,3 with exact rational arithmetic, not rounded decimals.
  • S006 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry0,2 with exact rational arithmetic, not rounded decimals.
  • S005 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry0,1 with exact rational arithmetic, not rounded decimals.
  • S004 · premise_and_result_audit — Recompute Matrix sum ORIGINAL entry0,0 with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Reverse-check ORIGINAL data,types,ordered roles,domain and premises;the conclusion need not uniquely recover its premises.Keep finite source candidates,independent review,formal proof and publication separate.
  • S002 · premise_and_result_audit — Reverse-check ORIGINAL data,types,ordered roles,domain and premises;the conclusion need not uniquely recover its premises.Keep finite source candidates,independent review,formal proof and publication separate.
  • S001 · premise_and_result_audit — Reverse-check ORIGINAL data,types,ordered roles,domain and premises;the conclusion need not uniquely recover its premises.Keep finite source candidates,independent review,formal proof and publication separate.

Result

[[-9, -8, -7, -6], [-6, -5, -4, -3]]

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: 32cfa0a2b4bd3ebc332c8e81732f3f7b470df06e416512da083df77bc34ebe2f
  • candidate record SHA-256: 0725aef2d9a7d92cd13703983407824f7e5ee5e477dcddb8f6b7e809e369521e
  • semantic review receipt SHA-256: 92bb5fa69818f30cd2806d74a26bd5ede6c48c80d2ecc3d31a5130d4ad7666b6
  • question-first witness SHA-256: 012b5aa905280d616be49aa9462daaa73bf7f6247d0a796e78bc5bcd24e6bd00
  • Lean: NOT_RUN · human review: NOT_PERFORMED
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