Theorem: Matroid.Flat.er_insert_eq_add_one (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
hF : M.Flat F
he : e ∈ M.E \ F
⊢ M.er (insert e F) = M.er F + 1
Tactic:
rw [Matroid.er_insert_eq_add_one]
State after:
case he
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
hF : M.Flat F
he : e ∈ M.E \ F
⊢ e ∈ M.E \ M.cl F

State before:
case he
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
hF : M.Flat F
he : e ∈ M.E \ F
⊢ e ∈ M.E \ M.cl F
Tactic:
rwa [hF.cl]
State after:
no goals