Installation and auxiliary functions
Installation

Like any other &GAP; package, &ResClasses; must be installed in the pkg subdirectory of the &GAP; distribution. This is done by extracting the distribution file in this directory. By default, the package &ResClasses; is autoloaded, otherwise you can load it via LoadPackage( "resclasses" );.

The &ResClasses; Package needs at least version 4.4 of &GAP;, is completely written in the &GAP; language and does neither contain nor require external binaries.

For the documentation the package &GAPDoc; is needed.

Building the manual
Nothing.
This function builds the manual of the &ResClasses; package in the file formats &LaTeX;, DVI, Postscript, PDF, HTML and ASCII text. This is done using the &GAPDoc; package by Frank Lübeck and Max Neunhöffer.
The testing routine
Nothing.
Performs tests of the &ResClasses; package. This function makes use of an adaptation of the test file tst/testall.g of the &GAP; library to this package.
Changing the viewing format for residue class unions
Nothing.
Switches between a longer and more descriptive (format = "long") and a shorter and less bulky (format = "short") viewing format for unions of residue classes.

The former is the default and should be used when not many residue classes have to be displayed or residue classes of different rings are used, but the latter is usually preferable if it is always clear which the base ring is and if the printed representation of many residue classes should fit on one screen. gap> ResidueClassUnionViewingFormat("short"); gap> ResidueClassUnion(Integers,12,[1,4,5,7,10,11]); 1(3) U 5(6) gap> ResidueClassUnionViewingFormat("long"); gap> ResidueClassUnion(Integers,12,[1,4,5,7,10,11]); Union of the residue classes 1(3) and 5(6) of Z