Theorem: Matroid.Nonloop.r_eq (Matroid/Rank.lean)

State before:
α : Type u_1
ι : Type u_2
M N : Matroid α
I B X X' Y Y' Z R : Set α
n : ℕ∞
e f : α
he : M.Nonloop e
⊢ M.r {e} = 1
Tactic:
rw [r, he.er_eq]
State after:
α : Type u_1
ι : Type u_2
M N : Matroid α
I B X X' Y Y' Z R : Set α
n : ℕ∞
e f : α
he : M.Nonloop e
⊢ toNat 1 = 1

State before:
α : Type u_1
ι : Type u_2
M N : Matroid α
I B X X' Y Y' Z R : Set α
n : ℕ∞
e f : α
he : M.Nonloop e
⊢ toNat 1 = 1
Tactic:
rfl
State after:
no goals