English
A weak antichain in Π i, α i is defined as an antichain with respect to the pointwise strict order.
Русский
Слабая антицепь в Π i, α i определяется как антицепь относительно покомпонентного строгого порядка.
LaTeX
$$$\\text{IsWeakAntichain}(s) \\coloneqq \\operatorname{IsAntichain}(\\prec, s)$$$
Lean4
/-- A weak antichain in `Π i, α i` is a set such that no two distinct elements are strongly less
than each other. -/
def IsWeakAntichain (s : Set (∀ i, α i)) : Prop :=
IsAntichain (· ≺ ·) s