Foto Circus 5

Links
- https://www.mathematics.uni-bonn.de/de/outreach/bonner-mathematische-gesellschaft/fotos-circus-mathematicus/9e134ac0-6c0b-4a05-9260-3a3c1d1e00a9.jpeg/image_view_fullscreen
- https://www.mathematics.uni-bonn.de/de/outreach/bonner-mathematische-gesellschaft/fotos-circus-mathematicus/9e134ac0-6c0b-4a05-9260-3a3c1d1e00a9.jpeg/@@download/image/9E134AC0-6C0B-4A05-9260-3A3C1D1E00A9.jpeg