refine' _root_.trans ?_ (Bertrand.real_main_inequality (by exact_mod_cast n_large))
n : ℕ
n_large : 512 ≤ n
⊢ ↑n * (↑2 * ↑n) ^ ↑(2 * n).sqrt * ↑4 ^ ↑(2 * n / 3) ≤ ↑4 ^ ↑n
n : ℕ
n_large : 512 ≤ n
⊢ ↑n * (↑2 * ↑n) ^ ↑(2 * n).sqrt * ↑4 ^ ↑(2 * n / 3) ≤ ↑n * (2 * ↑n) ^ (2 * ↑n).sqrt * 4 ^ (2 * ↑n / 3)