{"id":"x-matrix-full-scan-required","text":"The X-matrix check must visit all `n*n` cells because off-diagonal zeros must be verified, not just diagonal non-zeros; checking only diagonals would miss non-zero off-diagonal elements.","truth_value":"IN","source":"entries/2026/06/06/check-if-matrix-is-x-matrix-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"x-matrix-full-scan-required","truth_value":"IN","reason":"premise"}]}}