Theorem: Matroid.delete_delete_diff (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
D₁ D₂ : Set α
⊢ M ＼ D₁ ＼ D₂ = M ＼ D₁ ＼ (D₂ \ D₁)
Tactic:
simp
State after:
no goals