# H-space

> English word · Noun

## Definitions
1. A topological space X (generally assumed to be connected) together with a continuous map μ : X × X → X with an identity element e such that μ(e, x) = μ(x, e) = x for all x in X.

## Etymology
The H was suggested by Jean-Pierre Serre in recognition of the influence exerted on the subject by Heinz Hopf.

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