Math department, University of Duisburg-Essen
Hotel Motel One
Most places are in walking distance from the math building. To cover larger distances, you can use the subway (U-Bahn), tram (Straßenbahn) or a bus.
You need about 15 minutes from the station (if you don't get lost), either walking or taking the subway.
The easiest is to take a subway train (line U11, U17 or U18) from the train station and get off after two stops at Berliner Platz.
You then have to walk about 200 meters along Altendorfer Str., so that the big shopping centre Limbecker Platz is facing your back, and IKEA remains on your right, on the other side of the street.
Tickets can be bought at ticket machines in every underground station and at every tram stop, or in the EVAG centers in the underground station of the central train station, or at Berliner Platz.