English
For any integer m, if x^m is irrational, then x is irrational.
Русский
Для любого целого m, если x^m иррационально, то x иррационален.
LaTeX
$$$\forall m \in \mathbb{Z}, \; \operatorname{Irrational}(x^m) \Rightarrow \operatorname{Irrational}(x)$$$
Lean4
theorem of_zpow : ∀ m : ℤ, Irrational (x ^ m) → Irrational x
| (n : ℕ) => fun h => by
rw [zpow_natCast] at h
exact h.of_pow _
| -[n+1] => fun h => by
rw [zpow_negSucc] at h
exact h.of_inv.of_pow _