Theorem: Matroid.Minor.refl (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 : Set α
M₀ M₁ M₂ M : Matroid α
⊢ M = M ／ ∅ ＼ ∅
Tactic:
simp
State after:
no goals