Mathematikum is 0.5 mi (0.9 km) from central Giessen, why not stop by during your stay. If you want to experience more of the culture Giessen has to offer, head to Gleiberg Castle, Liebig Museum, and Hessenhallen.
Learn about the events happening at Hessenhallen during your trip to Giessen. Take in the museums while you're in the area.