Question 31426: Eigenpair Candidate with a Nonzero Vector

Original question and givens

Over R, the 2×2 matrix is M=[[2, 1], [0, 3]]. Is λ=99, v=[0, 0] a real eigenpair under the nonzero-eigenvector convention?

• G001 — Over R, the 2×2 matrix is M=[[2, 1], [0, 3]]. Is λ=99, v=[0, 0] a real eigenpair under the nonzero-eigenvector convention?

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-eigenvalue

Step-by-step derivation

source roles = [qf-eigenpair-candidate, eigenpair, domain, reals]

derived = [[NONZERO_vector_and_equality_YesNo]]

Eigen ORIGINAL row0 term0 := mul(2, 0)

Eigen ORIGINAL row0 term0 = 0

Eigen ORIGINAL row0 term1 := mul(1, 0)

Eigen ORIGINAL row0 term1 = 0

Eigen ORIGINAL Mv row0 sum := sum(0, 0)

Eigen ORIGINAL Mv row0 sum = 0

Eigen ORIGINAL lambda times v row0 := mul(99, 0)

Eigen ORIGINAL lambda times v row0 = 0

Eigen ORIGINAL residual row0 := sub(0, 0)

Eigen ORIGINAL residual row0 = 0

Eigen ORIGINAL row1 term0 := mul(0, 0)

Eigen ORIGINAL row1 term0 = 0

Eigen ORIGINAL row1 term1 := mul(3, 0)

Eigen ORIGINAL row1 term1 = 0

Eigen ORIGINAL Mv row1 sum := sum(0, 0)

Eigen ORIGINAL Mv row1 sum = 0

Eigen ORIGINAL lambda times v row1 := mul(99, 0)

Eigen ORIGINAL lambda times v row1 = 0

Eigen ORIGINAL residual row1 := sub(0, 0)

Eigen ORIGINAL residual row1 = 0

source roles = [[[2, 1], [0, 3]], 99, [0, 0], eigenpair]

derived = [[0, 0], [0, 0], [0, 0], Yes, No, No]

Reverse checks

• S012 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,types and premises;the conclusion need not uniquely recover its premises.This source-bound candidate is not independent review or formal proof.
• S011 · premise_and_result_audit — Recompute Eigen ORIGINAL residual row1 with exact rational arithmetic, not rounded decimals.
• S010 · premise_and_result_audit — Recompute Eigen ORIGINAL lambda times v row1 with exact rational arithmetic, not rounded decimals.
• S009 · premise_and_result_audit — Recompute Eigen ORIGINAL Mv row1 sum with exact rational arithmetic, not rounded decimals.
• S008 · premise_and_result_audit — Recompute Eigen ORIGINAL row1 term1 with exact rational arithmetic, not rounded decimals.
• S007 · premise_and_result_audit — Recompute Eigen ORIGINAL row1 term0 with exact rational arithmetic, not rounded decimals.
• S006 · premise_and_result_audit — Recompute Eigen ORIGINAL residual row0 with exact rational arithmetic, not rounded decimals.
• S005 · premise_and_result_audit — Recompute Eigen ORIGINAL lambda times v row0 with exact rational arithmetic, not rounded decimals.
• S004 · premise_and_result_audit — Recompute Eigen ORIGINAL Mv row0 sum with exact rational arithmetic, not rounded decimals.
• S003 · premise_and_result_audit — Recompute Eigen ORIGINAL row0 term1 with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Recompute Eigen ORIGINAL row0 term0 with exact rational arithmetic, not rounded decimals.
• S001 · premise_and_result_audit — Reverse-check the ORIGINAL inputs,types and premises;the conclusion need not uniquely recover its premises.This source-bound candidate is not independent review or formal proof.

Result

No

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.