Theorem: Matroid.flat_contract_iff' (Matroid/Flat.lean)

State before:
α : Type u_1
M : Matroid α
I F X Y F' F₀ F₁ F₂ P L H H₁ H₂ H' B C K : Set α
e f : α
⊢ (M ／ C).Flat F ↔ M.Flat (F ∪ C ∩ M.E) ∧ Disjoint F (C ∩ M.E)
Tactic:
rw [← contract_inter_ground_eq, flat_contract_iff]
State after:
no goals