English
For all i ∈ ℤ and a, b in a group, the conjugate of b by a raised to the integer i equals the conjugate of b^i by a: (a b a^{-1})^i = a b^i a^{-1}.
Русский
Для любого i ∈ ℤ и элементов a, b в группе выполняется: (a b a^{-1})^i = a b^i a^{-1}.
LaTeX
$$$\forall i \in \mathbb{Z},\ \forall a,b \in \alpha,\ (a b a^{-1})^{i} = a b^{i} a^{-1}$$$
Lean4
@[simp]
theorem conj_zpow {i : ℤ} {a b : α} : (a * b * a⁻¹) ^ i = a * b ^ i * a⁻¹ :=
by
cases i
· simp
· simp only [zpow_negSucc, conj_pow, mul_inv_rev, inv_inv]
rw [mul_assoc]