exact ⟨fun h ↦ by rw [h.cl], fun h ↦ by rw [loop_iff_mem_cl_empty, ← h]; exact M.mem_cl_self e⟩
α : Type u_1
β : Type u_2
M N : Matroid α
e f : α
B L L' I X Y Z F C K : Set α
he : e ∈ M.E
⊢ M.Loop e ↔ M.cl {e} = M.cl ∅
no goals