Theorem: Matroid.emptyOn_restriction (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 : Set α
M : Matroid α
⊢ emptyOn α = M ↾ ∅
Tactic:
simp
State after:
no goals