# Hausdorff gap

> English word · Noun

## Definitions
1. A pair of collections of integer sequences such that there is no integer sequence lying between the two.

## Etymology
Named after German mathematician Felix Hausdorff (1868–1942), who published proof of the first example in 1909.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/hausdorff-gap