Theorem: Matroid.loopyOn_delete (Matroid/Minor/Basic.lean)

State before:
α : Type u_1
M M' N : Matroid α
e f : α
I J R B X✝ Y Z K E✝ E X : Set α
⊢ loopyOn E ＼ X = loopyOn (E \ X)
Tactic:
rw [← restrict_compl, loopyOn_restrict, loopyOn_ground]
State after:
no goals