α : Type u_1
β : Type ?u.225442
inst✝² : Preorder α
p : α → Prop
inst✝¹ : DecidablePred p
inst✝ : LocallyFiniteOrderBot α
a : Subtype p
hp : ∀ ⦃a x : α⦄, x ≤ a → p a → p x
⊢ map (Embedding.subtype p) (Finset.subtype p (Iic ↑a)) = Iic ↑a
α : Type u_1
β : Type ?u.225442
inst✝² : Preorder α
p : α → Prop
inst✝¹ : DecidablePred p
inst✝ : LocallyFiniteOrderBot α
a : Subtype p
hp : ∀ ⦃a x : α⦄, x ≤ a → p a → p x
⊢ map (Embedding.subtype p) (Iic a) = Iic ↑a
rw [subtype_Iic_eq]
no goals
α : Type u_1
β : Type ?u.225442
inst✝² : Preorder α
p : α → Prop
inst✝¹ : DecidablePred p
inst✝ : LocallyFiniteOrderBot α
a : Subtype p
hp : ∀ ⦃a x : α⦄, x ≤ a → p a → p x
⊢ map (Embedding.subtype p) (Finset.subtype p (Iic ↑a)) = Iic ↑a
exact Finset.subtype_map_of_mem fun x hx => hp (mem_Iic.1 hx) a.prop