ABSTRACT
Abelian group Property of a group of elements associated with a binary operation. In an Abelian group, the group elements commute under the binary operation. If a and b are any two group elements and if the (+) sign denotes the binary operation, then, for an Abelian group, a + b = b + a. absolute plasma instabilities A class of plasma instabilities with amplitudes growing with time at a fixed point in the plasma medium. Compare with convective instabilities.
