English
For a ring seminorm μ on a commutative ring R, and x ∈ R, the real-valued sequence defined by a_n = μ(x^n)^{1/n} is considered: smoothingSeminormSeq(x) = (n ↦ μ(x^n)^{1/n}).
Русский
Для кольцевой семиномормы μ на R и элемента x ∈ R последовательность a_n = μ(x^n)^{1/n} задаётся как smoothingSeminormSeq(x).
LaTeX
$$$\text{ smoothingSeminormSeq }(x) : \mathbb{N} \to \mathbb{R},\quad n \mapsto \mu(x^n)^{1/n}$$$
Lean4
/-- The `ℝ`-valued sequence sending `n` to `(μ (x ^ n))^(1/n : ℝ)`. -/
abbrev smoothingSeminormSeq (x : R) : ℕ → ℝ := fun n => μ (x ^ n) ^ (1 / n : ℝ)