English
The lexicographic order on Lex is a bounded order, combining the orderBot and orderTop from the components.
Русский
Лексикографический порядок образует ограниченный порядок, объединяя нижнюю и верхнюю границы компонент.
LaTeX
$$$\text{BoundedOrder}(\Sigma_\text{Lex} i, α(i))$ with \text{orderBot} and \text{orderTop}.$$
Lean4
/-- The lexicographical linear order on a sigma type. -/
instance boundedOrder [PartialOrder ι] [BoundedOrder ι] [∀ i, Preorder (α i)] [OrderBot (α ⊥)] [OrderTop (α ⊤)] :
BoundedOrder (Σₗ i, α i) :=
{ Lex.orderBot, Lex.orderTop with }