{"schema":"vela.problem-packet.v0.1","problem":226,"statement":"Is there an entire non-linear function $f$ such that, for all $x\\in\\mathbb{R}$, $x$ is rational if and only if $f(x)$ is?","status":"solved","seam":"raw","closureRoutes":[],"obligations":[],"attestations":[],"attempts":[],"velaLean":[],"oeis":[],"generated_note":"derived view; the signed event log is the source of truth (vela check / vela reproduce)"}