Theorem: Matroid.spanning_iff_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
inst✝ : M.FiniteRk
hX : autoParam (X ⊆ M.E) _auto✝
⊢ M.Spanning X ↔ M.erk ≤ M.er X
Tactic:
rw [spanning_iff_er', and_iff_left hX]
State after:
no goals