lemma proved wrapper

`inv_pow_self`

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formal statement (Lean)

 105lemma inv_pow_self (φ : ℝ) (n : ℕ) : PhiClosed φ ((φ ^ n)⁻¹) :=

One-line wrapper that applies inv.

 106  inv (pow_self φ n)
 107

Lean names referenced from this declaration's body.