simp [flip]
α : Type u_1
r : α → α → Prop
inst✝ : Trans r r r
as : List α
b : α
bs : List α
hhook : HookedAscending r as (b :: bs)
⊢ ∀ {a b c : α}, flip r a b → flip r b c → flip r a c
α : Type u_1
r : α → α → Prop
inst✝ : Trans r r r
as : List α
b : α
bs : List α
hhook : HookedAscending r as (b :: bs)
⊢ ∀ {a b c : α}, r b a → r c b → r c a