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aaf4b9f | 1 2 3 4 5 6 7 8 9 10 11 12 13 | import Mathlib.Analysis.SpecialFunctions.Trigonometric.Basic
namespace OAI
namespace Ostmann
noncomputable def normalizedExpSum (s : Finset ℕ) (t : ℝ) : ℂ :=
(∑ n ∈ s, Complex.exp (2 * Real.pi * Complex.I * n * t)) / (s.card : ℂ)
end Ostmann
end OAI
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