<> Marcus Hausdorf <> Differential Equations in MuPAD I: An Object-Oriented Environment <> Internal Report 2000-17. Fakultät für Informatik, Universität Karlsruhe 2000 <> This report describes our MuPAD environment for differential equations superseding our earlier work in AXIOM (described in ). Until a full documentation of the implemented domains and categories is available (whenever this will be ;-), it serves also as user manual. Only the environment is treated; the implementation of some application packages for tasks like completion or symmetry analysis will be the topic of further reports in this series. <> reps <> postscript <> 2000 <> computer algebra, differential equation <> computer algebra, differential equations <>