Question 7641: Same-Shape Matrix Sum and Both Transpose Routes

Original question and givens

Use complete nonempty integer matrices with 1–5 rows and columns and 1-based external indices. Transposition is not inversion or reversal of element order. Same-shape M=[[3], [4], [5], [6]], N=[[0], [-1], [-2], [-3]]. Give (shape of M, M+N, (M+N)ᵀ, Mᵀ+Nᵀ).

• G001 — Use complete nonempty integer matrices with 1–5 rows and columns and 1-based external indices. Transposition is not inversion or reversal of element order. Same-shape M=[[3], [4], [5], [6]], N=[[0], [-1], [-2], [-3]]. Give (shape of M, M+N, (M+N)ᵀ, Mᵀ+Nᵀ).

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.

• mko-matrix

Step-by-step derivation

M=[[3], [4], [5], [6]];shape=[4, 1]

external indices start at1;transpose is not inverse

M transpose:source(1,1)=3

target(1,1)=3

M transpose:source(2,1)=4

target(1,2)=4

M transpose:source(3,1)=5

target(1,3)=5

M transpose:source(4,1)=6

target(1,4)=6

M shape=[4, 1];N shape=[4, 1]

same shape;entrywise sum permitted

M+N(1,1) := sum(3, 0)

M+N(1,1) = 3

M+N(2,1) := sum(4, -1)

M+N(2,1) = 3

M+N(3,1) := sum(5, -2)

M+N(3,1) = 3

M+N(4,1) := sum(6, -3)

M+N(4,1) = 3

sum transpose:source(1,1)=3

target(1,1)=3

sum transpose:source(2,1)=3

target(1,2)=3

sum transpose:source(3,1)=3

target(1,3)=3

sum transpose:source(4,1)=3

target(1,4)=3

N transpose:source(1,1)=0

target(1,1)=0

N transpose:source(2,1)=-1

target(1,2)=-1

N transpose:source(3,1)=-2

target(1,3)=-2

N transpose:source(4,1)=-3

target(1,4)=-3

MT+NT(1,1) := sum(3, 0)

MT+NT(1,1) = 3

MT+NT(1,2) := sum(4, -1)

MT+NT(1,2) = 3

MT+NT(1,3) := sum(5, -2)

MT+NT(1,3) = 3

MT+NT(1,4) := sum(6, -3)

MT+NT(1,4) = 3

left=[[3, 3, 3, 3]];right=[[3, 3, 3, 3]]

same value at every transposed coordinate

Reverse checks

• S023 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S022 · premise_and_result_audit — Recompute MT+NT(1,4) with exact rational arithmetic, not rounded decimals.
• S021 · premise_and_result_audit — Recompute MT+NT(1,3) with exact rational arithmetic, not rounded decimals.
• S020 · premise_and_result_audit — Recompute MT+NT(1,2) with exact rational arithmetic, not rounded decimals.
• S019 · premise_and_result_audit — Recompute MT+NT(1,1) with exact rational arithmetic, not rounded decimals.
• S018 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S015 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S014 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Recompute M+N(4,1) with exact rational arithmetic, not rounded decimals.
• S009 · premise_and_result_audit — Recompute M+N(3,1) with exact rational arithmetic, not rounded decimals.
• S008 · premise_and_result_audit — Recompute M+N(2,1) with exact rational arithmetic, not rounded decimals.
• S007 · premise_and_result_audit — Recompute M+N(1,1) with exact rational arithmetic, not rounded decimals.
• S006 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

([4, 1], [[3], [3], [3], [3]], [[3, 3, 3, 3]], [[3, 3, 3, 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.