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Theorem

Behrend's Theorem

Number Theory

Behrend's theorem is a result in arithmetic combinatorics stating that any subset of the integers from 1 to n in which no member is a multiple of any other member must have a logarithmic density that tends to zero as n grows large. The theorem is named for Felix Behrend, who published it in 1935. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/

Facts
Statement
The subsets of the integers from 1 to n in which no member of the set is a multiple of any other must have a logarithmic density that goes to zero as n becomes large. 1
Proof Year
1934 1
Classification
Statement Form
Inequality 1
Connections

Has Statement Form

Inequality, Concepts

Entity-backed identity for the statement-form enum value this theorem already carries, resolved to a mathematics concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The statement-form fact itself stays on the theorem unchanged.

In Branch

Source Behrend's theorem (Wikipedia)
Sources
1. Behrend's theorem (Wikipedia)
  • Introduction
    must have a logarithmic density that goes to zero as n becomes large
  • History
    Felix Behrend proved it in 1934, and published it in 1935
  • In Branch: Combinatorics, Lead sentence
    In arithmetic combinatorics, Behrend's theorem states that the subsets of the integers from 1 to n in which no member of the set i
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