  
  [1m[4m[31m1. Preface[0m
  
  This  package  provides  an easy-to-use implementation of residue classes as
  sets  which  permits to form unions, intersections and differences and which
  interacts   smoothly   with  finite  sets  of  ring  elements  w.r.t.  these
  operations. The functionality of this package is used in a group theoretical
  context by the [1mRCWA[0m package written by the same author.
  
  The  introduction  of  unions  of residue classes with fixed representatives
  which are implemented in this package since version 2.0 follows a suggestion
  by Wolfgang Rump.
  
