English
The space α →ᵇ γ is an algebra over 𝕜 with the structure map given by the constant algebra map and the pointwise operations.
Русский
Пространство α →ᵇ γ является алгеброй над 𝕜 со структурной картой константной алгебры и покоординатными операциями.
LaTeX
$$$\\text{Algebra}_{𝕜}(α \\to^b γ)$$$
Lean4
instance instSup : Max (α →ᵇ β) where
max f
g :=
{ toFun := f ⊔ g
continuous_toFun := f.continuous.sup g.continuous
map_bounded' := by
obtain ⟨C₁, hf⟩ := f.bounded
obtain ⟨C₂, hg⟩ := g.bounded
refine ⟨C₁ + C₂, fun x y ↦ ?_⟩
simp_rw [dist_eq_norm_sub] at hf hg ⊢
exact (norm_sup_sub_sup_le_add_norm _ _ _ _).trans (add_le_add (hf _ _) (hg _ _)) }