groupoid

A groupoid $G$ is a set together with a binary operation $\cdot :G\times G⟶G$. The groupoid (or “magma”) is closed under the operation.

There is also a separate, category-theoretic (http://planetmath.org/GroupoidCategoryTheoretic) definition of “groupoid.”

Title	groupoid
Canonical name	Groupoid
Date of creation	2013-03-22 12:16:03
Last modified on	2013-03-22 12:16:03
Owner	akrowne (2)
Last modified by	akrowne (2)
Numerical id	11
Author	akrowne (2)
Entry type	Definition
Classification	msc 20N02
Synonym	magma
Related topic	Semigroup
Related topic	Group
Related topic	LoopAndQuasigroup