In abstract algebra, group theory studies structures known as groups. Group theory has three historical sources number theory, the theory of algebraic equations, and geometry.

Eugene Schenkman has written:

'Group theory' -- subject(s): Group theory

Karl W. Gruenberg has written:

'Some cohomological topics in group theory' -- subject(s): Group theory, Homology theory, Theory of Groups

Bion's Theory

In group theory, an alternating group is a group of even permutations of a finite set.