rwa [hI.cl_eq_setOf_basis_insert, mem_setOf, basis_insert_iff]
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
hI : M.Indep I
⊢ x ∈ M.cl I ↔ M.Dep (insert x I) ∨ x ∈ I
no goals