Theorem: Matroid.er_eq_zero_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 = 0 ↔ X ∩ M.E ⊆ M.cl ∅
Tactic:
rw [← er_inter_ground_eq, er_eq_zero_iff]
State after:
no goals