Theorem: Matroid.not_nonloop_iff (Matroid/Loop.lean)

State before:
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✝
⊢ ¬M.Nonloop e ↔ M.Loop e
Tactic:
rw [← not_loop_iff, not_not]
State after:
no goals