English
The embedding a ↦ a defines an order embedding α ↪o WithTop α.
Русский
Отображение a ↦ a образует упорядочение как вложение α → WithTop α.
LaTeX
$$$\\text{OrderEmbedding}(a \\mapsto a) : α \\hookrightarrow\\mathrm{WithTop} α$$$
Lean4
/-- The coercion `α → WithTop α` bundled as monotone map. -/
@[simps -fullyApplied]
def coeOrderHom {α : Type*} [Preorder α] : α ↪o WithTop α
where
toFun := (↑)
inj' := WithTop.coe_injective
map_rel_iff' := WithTop.coe_le_coe