{"id":"tribonacci-tuple-swap-correctness","text":"The simultaneous tuple assignment `a, b, c = b, c, a+b+c` evaluates all RHS values before any assignment, ensuring correctness without temporary variables — a Python-specific idiom critical to the sliding-window recurrence.","truth_value":"IN","source":"entries/2026/06/06/n-th-tribonacci-number-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"tribonacci-tuple-swap-correctness","truth_value":"IN","reason":"premise"}]}}