English
For any l, toOfList l and ofToList interplay yields the original list: of_toList is inverse on IsList structures.
Русский
Для любого l взаимодействие toOfList и ofToList возвращает исходный список; инверсия на IsList структурах.
LaTeX
$$$\\operatorname{toList}(\\operatorname{ofList}(l)) = l$$$
Lean4
theorem of_toList : ∀ {l : Lists α}, IsList l → ofList (toList l) = l
| ⟨true, l⟩, _ => by simp_all [ofList, of']