English
The unop of a set of opposites is the set obtained by unop-ing each member.
Русский
Обратное множества противоположных элементов — это множество их выведения.
LaTeX
$$$$ \\operatorname{unop}(s) = \\operatorname{op}^{-1}(s) $$$$
Lean4
/-- The unop of a set `s` is the set obtained by taking the unop of each member of `s`. -/
protected def unop (s : Set αᵒᵖ) : Set α :=
op ⁻¹' s