Theorem: Matroid.Minor.C_indep (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
⊢ M.Indep h.C
Tactic:
obtain ⟨-,h,-⟩ := h.exists_contract_indep_delete_coindep.choose_spec
State after:
case intro.intro
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
h : M.Indep ⋯.choose
⊢ M.Indep h✝.C

State before:
case intro.intro
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
h : M.Indep ⋯.choose
⊢ M.Indep h✝.C
Tactic:
exact h
State after:
no goals