Theorem: Matroid.er_eq_top_iff (Matroid/Rank.lean)

State before:
α : Type u_1
ι : Type u_2
M N : Matroid α
I B X X' Y Y' Z R : Set α
n : ℕ∞
e f : α
⊢ M.er X = ⊤ ↔ ¬M.rFin X
Tactic:
rw [← er_ne_top_iff, not_ne_iff]
State after:
no goals