English
If ψ ≤ φ and f is uniformly convex on s with modulus φ, then f is uniformly convex on s with modulus ψ.
Русский
Пусть ψ ≤ φ и f выпукла( uniform convex ) на s с модулем φ; тогда f выпукла на s с модулем ψ.
LaTeX
$$$$ (\psi \le \phi) \Rightarrow (\text{UniformConvexOn}(s,\phi,f) \Rightarrow \text{UniformConvexOn}(s,\psi,f)). $$$$
Lean4
theorem mono (hψφ : ψ ≤ φ) (hf : UniformConvexOn s φ f) : UniformConvexOn s ψ f :=
⟨hf.1, fun x hx y hy a b ha hb hab ↦ (hf.2 hx hy ha hb hab).trans <| by gcongr; apply hψφ⟩