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Second neighborhood problem

Second neighborhood problem

Unsolved problem about oriented graphs.

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Readers' pathsAug 2026 – Oct 2026

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Share of the 52 clicks on its links

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    56%

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Readers come from

Share of the 98 readers arriving from another article

  1. Friendship paradox

    Phenomenon that most people have fewer friends than their friends have, on average.

    88%