Theorem: Matroid.LoopEquiv.er_eq_er (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
h : M.LoopEquiv X Y
⊢ M.er X = M.er Y
Tactic:
rw [← M.er_cl_eq, h.cl_eq_cl, M.er_cl_eq]
State after:
no goals