Skip to content

Sections

Maps Timeline Graph Cosmos Life Culture Innovation People Climate Trends Art

Browse Dictionary Search

© 2026 Vinony · Knowledge from Wikipedia, Wikidata, and 27 public APIs.

HNN extension · Vinony

🌐English

English Deutsch Español Français Português 中文日本語

HNN extension

EntityQ3062521· pop 6· linked from 29 articles

HNN extension

basic construction of combinatorial group theory

Wikidata facts

Named after: Hanna Neumann

via Wikidata · CC0

Connections

presentation of a group

Categories

Combinatorics on words Group theory

Sources

wikipedia.externallinksexternallink
Wikidata (CC0)wikidata-claims
Pixabayimage-pixabay

mathematics

Entity

International Standard Book Number

digital object identifier

abstract algebra

topological space

algebraic topology

Jean-Pierre Serre

group homomorphism

fundamental group

London Mathematical Society

conjugacy class

group isomorphism

Seifert–van Kampen theorem

Sign in to save

Similar entities

Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).

Entitydist 0.51

computational group theory

Entitydist 0.51

Zassenhaus lemma

Entitydist 0.58

Grothendieck–Teichmüller group

Entitydist 0.59

algebra extension

Entitydist 0.60

multiplicative group

Entitydist 0.61

Künneth theorem

Entitydist 0.61

conformal group

Entitydist 0.62

Entitydist 0.62

high-mobility group

Entitydist 0.63

direct product of groups

Entitydist 0.63

Entitydist 0.64

What links here29 pages

group extension

Hanna Neumann

Entity

Mladen Bestvina

ping-pong lemma

Bernhard Neumann

John R. Stallings