A groupoid G is a set together with a binary operationMathworldPlanetmath :G×GG. The groupoid (or “magma”) is closed underPlanetmathPlanetmath the operation.

There is also a separate, category-theoretic ( 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