README file for the `LocalizeRingForHomalg' GAP4 package To get the newest version of this GAP 4 package download one of the archive files LocalizeRingForHomalg-x.x.tar.gz LocalizeRingForHomalg-x.x.zoo LocalizeRingForHomalg-x.x.tar.bz2 LocalizeRingForHomalg-x.x.zip and unpack it using gunzip LocalizeRingForHomalg-x.x.tar.gz; tar xvf LocalizeRingForHomalg-x.x.tar respectively unzoo -x LocalizeRingForHomalg-x.x.zoo and so on. (Note that if you use a browser like `netscape' for downloading the archive file the `gunzip' step above may already be done by the browser, although the name of your file may still have the misleading `.gz' extension.) Do this preferably (but not necessarily) inside the `pkg' subdirectory of your GAP 4 installation. It creates a subdirectory called `LocalizeRingForHomalg'. This completes the installation of the package. Testing the package is possible by invoking ReadPackage( "LocalizeRingForHomalg", "maketest.g" ); from within GAP. You need the computer algebra system Singular (version >= 3-0-4) to run the tests. You also need the packages IO_ForHomalg, RingsForHomalg, and Modules from the homalg project to run the test. You can download them from: http://homalg.math.rwth-aachen.de/~barakat/homalg-project/ E-mail us if there are any questions, remarks, suggestions. Also, we would like to hear about applications of this package. Mohamed Barakat, e-mail: barakat@mathematik.uni-kl.de Markus Lange-Hegermann, e-mail: markus.lange.hegermann@rwth-aachen.de