Theorem: Matroid.ground_subset_cl_iff (Matroid/Closure.lean)

State before:
α : Type u_1
ι : Type u_2
M : Matroid α
F I J X Y B C R : Set α
e f x y : α
⊢ M.E ⊆ M.cl X ↔ M.cl X = M.E
Tactic:
simp [M.cl_subset_ground X, subset_antisymm_iff]
State after:
no goals