Hans Werner Ballmann is a German mathematician. His area of research is differential geometry with focus on geodesic flows, spaces of negative curvature as well as spectral theory of Dirac operators
Selected works
• Lectures on spaces of non positive curvatures (PDF; 818 kB), DMV Seminar, Birkhäuser 1995 • Spaces of non positive curvature, Jahresbericht DMV, vol. 103, 2001, pp. 52–65 • • • • • == References ==