Theorem: Pos.mul_right_comm (Extra/Pos/Lemmas.lean)

State before:
x y z : Pos
⊢ x * y * z = x * z * y
Tactic:
by_toNat
State after:
x y z : Pos
⊢ x.toNat * y.toNat * z.toNat = x.toNat * z.toNat * y.toNat

State before:
x y z : Pos
⊢ x.toNat * y.toNat * z.toNat = x.toNat * z.toNat * y.toNat
Tactic:
exact Nat.mul_right_comm ..
State after:
no goals