Theorem: Matroid.cl_insert_eq_of_mem_cl (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
he : e ∈ M.cl X
⊢ M.cl (insert e X) = M.cl X
Tactic:
rw [← cl_insert_cl_eq_cl_insert, insert_eq_of_mem he, cl_cl]
State after:
no goals