English
If s is bounded with respect to r and r ≤ r', then s is bounded with respect to r'.
Русский
Если множество s ограничено относительно отношения r и r ≤ r', то оно ограничено относительно r'.
LaTeX
$$$ \operatorname{Bounded}(r,s) \land (r \le r') \Rightarrow \operatorname{Bounded}(r',s) $$$
Lean4
theorem rel_mono {r' : α → α → Prop} (h : Bounded r s) (hrr' : r ≤ r') : Bounded r' s :=
let ⟨a, ha⟩ := h
⟨a, fun b hb => hrr' b a (ha b hb)⟩