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caec230 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | import OAI.MeasureTheory.DyadicAvoidance.Model
namespace OAI
noncomputable section
namespace Problem310
def OnePeriodic (H : Set ℝ) : Prop :=
∀ x : ℝ, x + 1 ∈ H ↔ x ∈ H
def periodDensity (H : Set ℝ) : ENNReal :=
MeasureTheory.volume (H ∩ Set.Icc (0 : ℝ) 1)
end Problem310
end
end OAI
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