Theorem: Matroid.delete_loops_eq (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 D✝ D₁ D₂ R : Set α
M : Matroid α
D : Set α
⊢ (M ＼ D).cl ∅ = M.cl ∅ \ D
Tactic:
simp
State after:
no goals