English
The well-foundedness of the image f''s is equivalent to the well-foundedness of s under the transported relation r on f.
Русский
Хорошо основанность образа f'' s эквивалентна хорошо основанности множества s под переносимым отношением r на f.
LaTeX
$$(f'' s).WellFoundedOn r \\iff s.WellFoundedOn (r \\text{ on } f)$$
Lean4
@[simp]
theorem wellFoundedOn_image {s : Set β} : (f '' s).WellFoundedOn r ↔ s.WellFoundedOn (r on f) := by rw [image_eq_range];
exact wellFoundedOn_range