Stackexchange iconStackexchangeSep 10, 2026

Erdös and his numbers

Mathematicians who co-authored a paper with Erdös received an Erdös number of 1, their co-authors who didn't co-author with Erdös got a number of 2 and so on.

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Mathematicians who co-authored a paper with Erdös received an Erdös number of 1, their co-authors who didn't co-author with Erdös got a number of 2 and so on.

Paul Erdös was a prolific mathematician who published over 1500 papers.

The Erdös numbers measure how mathematicians collaborate.

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The useful part

Mathematicians who co-authored a paper with Erdös received an Erdös number of 1, their co-authors who didn't co-author with Erdös got a number of 2 and so on. Paul Erdös was a prolific mathematician who published over 1500 papers. The Erdös numbers measure how mathematicians collaborate.

How it works

  • The Erdös numbers measure how mathematicians collaborate.

Example or evidence

  • Paul Erdös was a prolific mathematician who published over 1500 papers.

Details worth keeping

Anna and Ben have Erdös numbers of 3 and 5, respectively. Charlie co-authored a paper with Anna and a paper with Ben.

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