{"schema":"vela.problem-packet.v0.1","problem":595,"statement":"Is there an infinite graph $G$ which contains no $K_4$ and is not the union of countably many triangle-free graphs?","status":"open","seam":"raw","closureRoutes":[],"obligations":[],"attestations":[],"attempts":[{"id":"att_c27d897a442ec40f","kind":"dead_end","claim":"attempted via frontier '?' (transfer_strength=n/a) -> no_progress","grade":"honest_null","gateStatus":"needs_verification","superseded":false}],"velaLean":[],"oeis":[],"generated_note":"derived view; the signed event log is the source of truth (vela check / vela reproduce)"}