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

State before:
x : Pos
⊢ 1 * x = x
Tactic:
by_toNat
State after:
x : Pos
⊢ 1 * x.toNat = x.toNat

State before:
x : Pos
⊢ 1 * x.toNat = x.toNat
Tactic:
exact Nat.one_mul _
State after:
no goals