Question 7647: 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=[[9, 8], [10, 9], [11, 10], [12, 11], [13, 12]], N=[[0, 1], [-1, 0], [-2, -1], [-3, -2], [-4, -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=[[9, 8], [10, 9], [11, 10], [12, 11], [13, 12]], N=[[0, 1], [-1, 0], [-2, -1], [-3, -2], [-4, -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=[[9, 8], [10, 9], [11, 10], [12, 11], [13, 12]];shape=[5, 2]

external indices start at1;transpose is not inverse

M transpose:source(1,1)=9

target(1,1)=9

M transpose:source(1,2)=8

target(2,1)=8

M transpose:source(2,1)=10

target(1,2)=10

M transpose:source(2,2)=9

target(2,2)=9

M transpose:source(3,1)=11

target(1,3)=11

M transpose:source(3,2)=10

target(2,3)=10

M transpose:source(4,1)=12

target(1,4)=12

M transpose:source(4,2)=11

target(2,4)=11

M transpose:source(5,1)=13

target(1,5)=13

M transpose:source(5,2)=12

target(2,5)=12

M shape=[5, 2];N shape=[5, 2]

same shape;entrywise sum permitted

M+N(1,1) := sum(9, 0)

M+N(1,1) = 9

M+N(1,2) := sum(8, 1)

M+N(1,2) = 9

M+N(2,1) := sum(10, -1)

M+N(2,1) = 9

M+N(2,2) := sum(9, 0)

M+N(2,2) = 9

M+N(3,1) := sum(11, -2)

M+N(3,1) = 9

M+N(3,2) := sum(10, -1)

M+N(3,2) = 9

M+N(4,1) := sum(12, -3)

M+N(4,1) = 9

M+N(4,2) := sum(11, -2)

M+N(4,2) = 9

M+N(5,1) := sum(13, -4)

M+N(5,1) = 9

M+N(5,2) := sum(12, -3)

M+N(5,2) = 9

sum transpose:source(1,1)=9

target(1,1)=9

sum transpose:source(1,2)=9

target(2,1)=9

sum transpose:source(2,1)=9

target(1,2)=9

sum transpose:source(2,2)=9

target(2,2)=9

sum transpose:source(3,1)=9

target(1,3)=9

sum transpose:source(3,2)=9

target(2,3)=9

sum transpose:source(4,1)=9

target(1,4)=9

sum transpose:source(4,2)=9

target(2,4)=9

sum transpose:source(5,1)=9

target(1,5)=9

sum transpose:source(5,2)=9

target(2,5)=9

N transpose:source(1,1)=0

target(1,1)=0

N transpose:source(1,2)=1

target(2,1)=1

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

target(1,2)=-1

N transpose:source(2,2)=0

target(2,2)=0

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

target(1,3)=-2

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

target(2,3)=-1

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

target(1,4)=-3

N transpose:source(4,2)=-2

target(2,4)=-2

N transpose:source(5,1)=-4

target(1,5)=-4

N transpose:source(5,2)=-3

target(2,5)=-3

MT+NT(1,1) := sum(9, 0)

MT+NT(1,1) = 9

MT+NT(1,2) := sum(10, -1)

MT+NT(1,2) = 9

MT+NT(1,3) := sum(11, -2)

MT+NT(1,3) = 9

MT+NT(1,4) := sum(12, -3)

MT+NT(1,4) = 9

MT+NT(1,5) := sum(13, -4)

MT+NT(1,5) = 9

MT+NT(2,1) := sum(8, 1)

MT+NT(2,1) = 9

MT+NT(2,2) := sum(9, 0)

MT+NT(2,2) = 9

MT+NT(2,3) := sum(10, -1)

MT+NT(2,3) = 9

MT+NT(2,4) := sum(11, -2)

MT+NT(2,4) = 9

MT+NT(2,5) := sum(12, -3)

MT+NT(2,5) = 9

left=[[9, 9, 9, 9, 9], [9, 9, 9, 9, 9]];right=[[9, 9, 9, 9, 9], [9, 9, 9, 9, 9]]

same value at every transposed coordinate

Reverse checks

• S053 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S052 · premise_and_result_audit — Recompute MT+NT(2,5) with exact rational arithmetic, not rounded decimals.
• S051 · premise_and_result_audit — Recompute MT+NT(2,4) with exact rational arithmetic, not rounded decimals.
• S050 · premise_and_result_audit — Recompute MT+NT(2,3) with exact rational arithmetic, not rounded decimals.
• S049 · premise_and_result_audit — Recompute MT+NT(2,2) with exact rational arithmetic, not rounded decimals.
• S048 · premise_and_result_audit — Recompute MT+NT(2,1) with exact rational arithmetic, not rounded decimals.
• S047 · premise_and_result_audit — Recompute MT+NT(1,5) with exact rational arithmetic, not rounded decimals.
• S046 · premise_and_result_audit — Recompute MT+NT(1,4) with exact rational arithmetic, not rounded decimals.
• S045 · premise_and_result_audit — Recompute MT+NT(1,3) with exact rational arithmetic, not rounded decimals.
• S044 · premise_and_result_audit — Recompute MT+NT(1,2) with exact rational arithmetic, not rounded decimals.
• S043 · premise_and_result_audit — Recompute MT+NT(1,1) with exact rational arithmetic, not rounded decimals.
• S042 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S039 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S038 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S033 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S032 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S029 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S028 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S025 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• 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 — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S022 · premise_and_result_audit — Recompute M+N(5,2) with exact rational arithmetic, not rounded decimals.
• S021 · premise_and_result_audit — Recompute M+N(5,1) with exact rational arithmetic, not rounded decimals.
• S020 · premise_and_result_audit — Recompute M+N(4,2) with exact rational arithmetic, not rounded decimals.
• S019 · premise_and_result_audit — Recompute M+N(4,1) with exact rational arithmetic, not rounded decimals.
• S018 · premise_and_result_audit — Recompute M+N(3,2) with exact rational arithmetic, not rounded decimals.
• S017 · premise_and_result_audit — Recompute M+N(3,1) with exact rational arithmetic, not rounded decimals.
• S016 · premise_and_result_audit — Recompute M+N(2,2) with exact rational arithmetic, not rounded decimals.
• S015 · premise_and_result_audit — Recompute M+N(2,1) with exact rational arithmetic, not rounded decimals.
• S014 · premise_and_result_audit — Recompute M+N(1,2) with exact rational arithmetic, not rounded decimals.
• S013 · premise_and_result_audit — Recompute M+N(1,1) with exact rational arithmetic, not rounded decimals.
• 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 — 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 — 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

([5, 2], [[9, 9], [9, 9], [9, 9], [9, 9], [9, 9]], [[9, 9, 9, 9, 9], [9, 9, 9, 9, 9]], [[9, 9, 9, 9, 9], [9, 9, 9, 9, 9]])

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.