English
The supremum of a chain in the product ω-CPO is the pair of the supremums of the projections: ωSup (c) = (ωSup (fst ∘ c), ωSup (snd ∘ c)).
Русский
Найдём точку верхней грани для произведения ω-CPO: супремум цепи в произведении равен паре супремумов проекций.
LaTeX
$$$\omegaSup(c) = (\omegaSup(\mathrm{map\ fst}\ c), \omegaSup(\mathrm{map\ snd}\ c))$$$
Lean4
/-- The supremum of a chain in the product `ω`-CPO. -/
@[simps]
protected def ωSupImpl (c : Chain (α × β)) : α × β :=
(ωSup (c.map OrderHom.fst), ωSup (c.map OrderHom.snd))