English
For every order-preserving map f: α →o β and every NonemptyInterval a ⊆ α, the dual of the image a.map f equals the image of the dual interval under the dual map: dual(a.map f) = a.dual.map f.dual.
Русский
Для каждого порядок-отображения f: α →o β и каждого ненулевого интервала a ⊆ α выполняется: dual(a.map f) = a.dual.map f.dual.
LaTeX
$$$\text{dual}(a.map f) = a.dual.map f.dual$$$
Lean4
@[simp]
theorem dual_map (f : α →o β) (a : NonemptyInterval α) : dual (a.map f) = a.dual.map f.dual :=
rfl