Theorem: Matroid.Minor.finitary (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 ≤m M
inst✝ : M.Finitary
⊢ N.Finitary
Tactic:
obtain ⟨C, D, rfl⟩ := minor_iff_exists_contract_delete.1 h
State after:
case intro.intro
α : Type u_1
M M' : Matroid α
e f : α
I J R B X Y Z K : Set α
M₀ M₁ M₂ : Matroid α
inst✝ : M.Finitary
C D : Set α
h : M ／ C ＼ D ≤m M
⊢ (M ／ C ＼ D).Finitary

State before:
case intro.intro
α : Type u_1
M M' : Matroid α
e f : α
I J R B X Y Z K : Set α
M₀ M₁ M₂ : Matroid α
inst✝ : M.Finitary
C D : Set α
h : M ／ C ＼ D ≤m M
⊢ (M ／ C ＼ D).Finitary
Tactic:
infer_instance
State after:
no goals