  Stochastic local operations and classical communication (SLOCC), also called
local filtering operations, are a convenient, useful set of quantum operations
in grasping essential properties of entanglement. We give a quick overview
about the characteristics of multipartite entanglement in terms of SLOCC,
illustrating the 2-qubit and the rest (2 x 2 x n) quantum system. This not only
includes celebrated results of 3-qubit pure states, but also has implications
to 2-qubit mixed states.
