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Groupoid: Examples, Definitions & Relation to groups

In mathematics, especially in category theory and homotopy theory, a groupoid (less often Brandt groupoid or virtual group) generalises the notion of group in several equivalent ways. A groupoid can be seen as a:

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Groupoid topic overview

The analysis highlights Examples, Definitions and Relation to groups as prominent areas in the source structure around Groupoid.

Related topics
121
Source areas
6
Connected nodes
127
Extracted relationships
177
Concept neighborhoods
52
Bridge connections
127

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Examples · 33 topics
Overview · 32 topics
Definitions · 19 topics
Relation to groups · 17 topics
Groupoids with geometric structures · 11 topics
Category of groupoids · 9 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

Definitions

Examples

Relation to groups

Category of groupoids

Groupoids with geometric structures

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How Groupoid connects Entity context

The extracted context around Groupoid shows recurring relationship patterns in the source. For example, Groupoid → Alan, Algebra, Also, Amer, AMS, AMS Bookstore, Applications, BF01209171, BFb0066890, Booksurge, Borceux, Brandt, Bull, Cambridge Univ, Cannas, Categories, Category, Contemp, CS1, Dicks Another extracted example is Groupoid → Conversely, Denote, Explicit, Given, Let, The, Then, We. Use these groups to spot repeated connection types before inspecting the individual relationships.

Groupoid

Top relations

related to References · 94
Groupoid → Alan, Algebra, Also, Amer, AMS, AMS Bookstore, Applications, BF01209171, BFb0066890, Booksurge, Borceux, Brandt, Bull, Cambridge Univ, Cannas, Categories, Category, Contemp, CS1, Dicks
related to Comparing the definitions · 8
Groupoid → Conversely, Denote, Explicit, Given, Let, The, Then, We
related to Groupoids with geometric structures · 8
Groupoid → For, Groupoids, Lie, Poisson, Riemannian, Similarly, These, When
related to Fundamental groupoid · 7
Groupoid → Accordingly, Given, Moreover, Pi, The, This, Two
related to Category of groupoids · 5
Groupoid → Cartesian, GPD, Grpd, The, Thus
related to Relation to groups · 5
Groupoid → By, Every, If, Many, Using
is a · 4
Groupoid → category in which every morphism has an inverse.If, groupoid introduced by John Horton Conway acting on 13 points such that the elements fixing a point form a copy of the Mathieu group M12, small category in which every morphism is an isomorphism, small category with o b
related to Algebraic · 4
Groupoid → For, Here, Precisely, The
related to Group action · 4
Groupoid → Composition, For, If, The
related to Mathieu groupoid · 4
Groupoid → John Horton Conway, M12, Mathieu, The Mathieu

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

displaystyle group groupoids set category morphisms morphism one groups theory action given objects equivalence -1 mathrm every isomorphic form fundamental

Groupoid relationships Subject–Predicate–Object triples

TTTA extracted 177 structured relationships around Groupoid. Examples in this analysis include Groupoid → is a → small category in which every morphism is an isomorphism and Groupoid → is a → category in which every morphism has an inverse.If. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
Groupoidis asmall category in which every morphism is an isomorphism0.90text
Groupoidis acategory in which every morphism has an inverse.If0.90text
Groupoidis asmall category with o b0.90text
Groupoidis agroupoid introduced by John Horton Conway acting on 13 points such that the elements fixing a point form a copy of the Mathieu group M120.90text
manifoldsinstance ofGroupoids are often used to reason about geometrical objects0.80text
the Rubik's Cube can be modeled using group theoryinstance ofthen this construction can be used to form a presheaf of groupoids.PuzzlesWhile puzzles0.80text
the Rubik's Cube can be modeled using group theoryinstance ofPuzzlesWhile puzzles0.80text
Groupoidrelated to AlgebraicPrecisely0.60section
Groupoidrelated to AlgebraicHere0.60section
Groupoidrelated to AlgebraicThe0.60section
Groupoidrelated to AlgebraicFor0.60section
Groupoidrelated to Category of groupoidsThe0.60section

Related concept clusters Concept neighborhoods

The concept neighborhoods around Groupoid bring nearby vocabulary together. In this analysis, examples include Displaystyle, Group and Set. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Groupoid
    • Displaystyle
    • Group
    • Set
    • Fundamental
    • Groups
    • One
    • Morphisms
    • Form
    • Given
    • Objects
    • Groupoids
    • Transitive
  • groupoid
    • Displaystyle
    • Group
    • Set
    • Fundamental
    • Groups
    • One
    • Morphisms
    • Form
    • Given
    • Objects
    • Groupoids
    • Transitive
  • category
    • Groupoid
    • Theory
    • Every
    • Groupoids
    • Morphism
    • Morphisms
    • Mathrm
    • Group
    • Sets
    • Structure
    • Displaystyle
    • Functor
  • group
    • Groupoid
    • Action
    • Set
    • Theory
    • One
    • Vertex
    • Displaystyle
    • Groupoids
    • Object
    • Groups
    • Isomorphic
    • Fundamental
  • partial function
    • Also
    • Times
    • -1
    • Every
    • Mathrm
    • Objects
    • Composition
    • Morphism
    • Algebraic
    • Classes
    • Morphisms
    • Groups
  • group theory
    • Groupoids
    • Groupoid
    • Action
    • Set
    • Category
    • Group
    • Theory
    • One
    • Vertex
    • Displaystyle
    • Fundamental
    • Object
  • equivalence relation
    • Relation
    • Classes
    • Times
    • Set
    • Action
    • Algebraic
    • Orbit
    • Two
    • Also
    • Groups
    • Arrows
    • Sets
  • action
    • Group
    • Set
    • Orbit
    • Equivalence
    • Vertex
    • Relation
    • Groups
    • Displaystyle
    • Also
    • Groupoid
    • Times
    • Transitive

Connections between topic areas Semantic bridges

For Groupoid, one of the stronger structural bridges in this analysis connects Groupoid with Examples. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
GroupoidExamples · splits 94 ⟂ 34
GroupoidOverview · splits 95 ⟂ 33
GroupoidDefinitions · splits 108 ⟂ 20
GroupoidRelation to groups · splits 110 ⟂ 18
GroupoidGroupoids with geometric structures · splits 116 ⟂ 12
GroupoidCategory of groupoids · splits 118 ⟂ 10

Map overview Semantic statistics

Groupoid

Nodes128
Edges127
Triples177
Avg. degree1.98
Density0.015625
Components1

Source & methodology

TTTA analyzes the structure around Groupoid to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as Examples, Definitions & Relation to groups, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Groupoid · EN edition · Analysis: TopicsToTalkAbout

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