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German mathematician
Hans Werner Ballmann (known as Werner Ballmann; born 11 April 1951) 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
Ballmann earned his doctorate from the
University of Bonn in 1979, under the supervision of
Wilhelm Klingenberg.
[1]
He currently is a professor at the University of Bonn, and the managing director of the
Max Planck Institute for Mathematics in Bonn, Germany, since 2007.
[2] He has advised 16 doctoral students at Bonn, including
Christian Bär and
Anna Wienhard.
[1]
He is a member of the
German Academy of Sciences Leopoldina since 2007,
[3] and a member of the scientific committee of the
Mathematical Research Institute of Oberwolfach since 2004.
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
- Der Satz von Lusternik und Schnirelmann, Bonner Mathematische Schriften, vol. 102, 1978, pp. 1–25
- Ballmann, Werner; Thorbergsson, Gudlaugur; Ziller, Wolfgang (1982). "Closed geodesics on positively curved manifolds".
Annals of Mathematics. 116 (2): 213–247.
doi:
10.2307/2007062.
JSTOR
2007062.
MR
0672836.
- Ballmann, Werner (1985). "Nonpositively Curved Manifolds of Higher Rank".
The Annals of Mathematics. 122 (3). JSTOR: 597–609.
doi:
10.2307/1971331.
ISSN
0003-486X.
JSTOR
1971331.
- with M. Brin: Orbihedra of nonpositive curvature.
Publications Mathématiques de l'IHÉS No. 82 (1995), 169–209 (1996).
- Ballmann, Werner; Światkowski, Jacek (1997). "On -cohomology and property (T) for automorphism groups of polyhedral cell complexes".
Geometric and Functional Analysis. 7 (4): 615–645.
doi:
10.1007/s000390050022.
MR
1465598.
S2CID
15531550.
References
External links
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