English
The setOf construction turns a predicate into a set: setOf(p) = { x | p(x) }.
Русский
Построение setOf превращает предикат в множество: setOf(p) = { x | p(x) }.
LaTeX
$$$\\mathrm{setOf}(p) = \\{ x : \\alpha \\mid p(x) \\}$$$
Lean4
/-- Turn a predicate `p : α → Prop` into a set, also written as `{x | p x}` -/
def setOf {α : Type u} (p : α → Prop) : Set α :=
p