Theorem: Matroid.Restriction.minor (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 : Matroid α
h : N ≤r M
⊢ N ≤m M
Tactic:
rw [← h.eq_restrict, ← delete_compl h.subset]
State after:
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 : Matroid α
h : N ≤r M
⊢ M ＼ (M.E \ N.E) ≤m M

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 : Matroid α
h : N ≤r M
⊢ M ＼ (M.E \ N.E) ≤m M
Tactic:
apply delete_minor
State after:
no goals