Regensburg is easily accessible by air, rail, and car. The nearest airports are Munich and Nuremberg. From there one can rejoin Regensburg by train or by airport shuttle.
You can find the University of Regensburg using the link of the department of mathematics or of the university. On campus you can find the building for mathematics with this map.
"The only authentically preserved large medieval city in Germany."
The beautiful old town of Regensburg is part of the
UNESCO world heritage.