{"schema":"vela.problem-packet.v0.1","problem":926,"statement":"Let $k\\geq 4$. Is it true that\\[\\mathrm{ex}(n;H_k) \\ll_k n^{3/2},\\]where $H_k$ is the graph on vertices $x,y_1,\\ldots,y_k,z_1,\\ldots,z_{\\binom{k}{2}}$, where $x$ is adjacent to all $y_i$ and each pair of $y_i,y_j$ is adjacent to a unique $z_i$.","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)"}