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← IsBehrend — multiples have density 1
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Lean 4.29.1
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Mathlib v4.29.1
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12 days ago
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Lean 4 / Mathlib
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import Mathlib /-- A sequence of naturals $(a_i)$ is _Behrend_ if almost all integers are a multiple of some $a_i$. In other words, if the set of multiples has natural density $1$. -/ def IsBehrend {ι : Type*} (A : ι → ℕ) : Prop := (MultiplesOf A).HasDensity 1
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