Theorem: Matroid.parallel_iff (Matroid/Parallel.lean)

State before:
α : Type u_1
M N : Matroid α
e f g : α
I X P D : Set α
⊢ M.Parallel e f ↔ M.Nonloop e ∧ M.Nonloop f ∧ M.cl {e} = M.cl {f}
Tactic:
simp [Parallel, parallelClasses, and_comm (a := _ ∈ M.E), nonloop_iff_mem_compl_loops]
State after:
no goals