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&ResClasses; is a package for &GAP; 4 which provides a fully-featured
and easy-to-use implementation of set-theoretic unions of residue classes
of the integers and of a few other rings. <P/>
The class of sets which &ResClasses; can deal with includes the open and
the closed sets in the topology on the respective ring which is induced by
taking the set of all residue classes as a basis, as far as the usual
restrictions imposed by the finiteness of computing resources permit this.
<P/>
The package further provides slightly more specialized functionality
for unions of residue classes with distinguished representatives and
signed moduli. <P/>
The &ResClasses; package is used in a group theoretical context by the
&RCWA; package <Cite Key=
"RCWA"/>.
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