{"schema":"vela.problem-packet.v0.1","problem":28,"statement":"If $A\\subseteq \\mathbb{N}$ is such that $A+A$ contains all but finitely many integers then $\\limsup 1_A\\ast 1_A(n)=\\infty$.","status":"open","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)"}