(topology) For a specified topological space, the group whose elements are homotopy classes of loops (images of some arbitrary closed interval whose endpoints are both mapped to a designated point) and whose group operation is concatenation.

plural of age group

plural of rock group

(algebra) A group in which the group operation is commutative.

plural of focus-group (alternative spelling of focus groups).

(topology) A group which is also a topological space and whose group operations are continuous functions.

plural of topological group

A blood type.

(mathematics) A group whose elements are precisely all of the bijections of some set with itself and whose operation is composition of those bijections.

plural of functional group