{"id":"null-subroot-is-always-subtree","text":"`isSubtree(any_root, None)` returns `True`, matching the LeetCode contract that an empty tree is a subtree of any tree","truth_value":"IN","source":"entries/2026/06/06/subtree-of-another-tree-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"null-subroot-is-always-subtree","truth_value":"IN","reason":"premise"}]}}