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<Abstract>

  &ResClasses; is a package for &GAP; 4, which provides a fully-featured
  and easy-to-use implementation of residue classes of&nbsp;<M>\Z</M> and
  a few other rings as sets.

  The package further provides slightly more specialized functionality
  for unions of residue classes with distinguished representatives and
  signed moduli.

  The &ResClasses; package is used in a group theoretical context by the
  &RCWA; package&nbsp;<Cite Key="RCWA"/>.

</Abstract>

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