English
For all m,n,k, ack(m, pair(n,k)) < ack(m+4, max(n,k)).
Русский
Для всех m,n,k: ack(m, пары(n,k)) < ack(m+4, max(n,k)).
LaTeX
$$$$\\forall m,n,k \\in \\mathbb{N}, \\operatorname{ack}(m, \\operatorname{pair}(n,k)) < \\operatorname{ack}(m+4, \\max(n,k)).$$$$
Lean4
theorem ack_pair_lt (m n k : ℕ) : ack m (pair n k) < ack (m + 4) (max n k) :=
(ack_strictMono_right m <| pair_lt_max_add_one_sq n k).trans <| ack_add_one_sq_lt_ack_add_four _ _