intros heq
case mpr
α : Type u_1
b c : Basis α
h : ∀ (b c : Basis ?m.10532), as_filter b = as_filter c → b ≤' c
⊢ as_filter b = as_filter c → b ≤' c ∧ c ≤' b
case mpr
α : Type u_1
b c : Basis α
h : ∀ (b c : Basis ?m.10532), as_filter b = as_filter c → b ≤' c
heq : as_filter b = as_filter c
⊢ b ≤' c ∧ c ≤' b