Theorem: Matroid.cl_union_cl_left_eq (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 : Matroid α
X Y : Set α
⊢ M.cl (M.cl X ∪ Y) = M.cl (X ∪ Y)
Tactic:
rw [← cl_cl_union_cl_eq_cl_union, cl_cl, cl_cl_union_cl_eq_cl_union]
State after:
no goals