simp_rw [_root_.not_imp, not_not, ← singleton_subset_iff, indep_iff]
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 : autoParam (e ∈ M.E) _auto✝
⊢ (∃ x, ¬(M.Base x → e ∉ x)) ↔ M.Indep {e}
no goals