# Erdős number

Definition from Wiktionary, the free dictionary

## Contents

## English[edit]

### Etymology[edit]

Named for the Hungarian mathematician Paul Erdős.

### Noun[edit]

**Erdős number** (*plural* **Erdős numbers**)

- (mathematics) A number describing the degree of collaboration between a mathematician and Paul Erdős, defined such that a mathematician who has written a paper with Erdős has an Erdős number of 1, a mathematician who has written a paper with somebody having an Erdős number of 1 has an Erdős number of two, and so on.