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Publications

[Generalities | Preprints | Books | Published articles | Proceedings | Lecture notes | Theses]

Generalities

Some of the articles can not be downloaded from the journals without registrations etc. If there is any problem with this please drop me a line and I will send you a reprint.

Most of my publications can be found on the xxx-preprint server. Typically, these preliminary versions do not differ too much from the final ones. Moreover, you can find at least some of them in MathSciNet or in Zentralblatt. Finally, I also write sometimes contributions for the Mathematical Reviews.

Preprints

  1. Matthias Schötz, Stefan Waldmann: Convergent Star Products for Projective Limits of Hilbert Spaces.
    Preprint. To appear in J. Funct. Anal. 2017, 34 pages.
    [Abstract] [Postscript] [PDF]
  2. Michel Cahen, Simone Gutt, Stefan Waldmann: Nuclear Group Algebras for Finitely Generated Groups.
    Preprint. October 2016, 24 pages.
    [Abstract] [Postscript] [PDF]
  3. Pierre Bieliavsky, Chiara Esposito, Stefan Waldmann, Thomas Weber: Obstructions for Twist Star Products.
    Preprint. July 2016, 8 pages.
    [Abstract] [Postscript] [PDF]
  4. Martin Bordemann, Gregory Ginot, Gilles Halbout, Hans-Christian Herbig, Stefan Waldmann: Formalite G_\infty adaptee et star-representations sur des sous-varietes coisotropes.
    Preprint April 2005, 55 pages.
    [Abstract] [Postscript] [PDF]

Books and Editorial work

  1. Stefan Waldmann: Lineare Algebra 2. Anwendungen und Konzepte für Studierende der Mathematik und Physik
    Springer-Verlag Heidelberg, New York, 2017.
    [MR] [Zbl06750713] [Errata]
  2. Stefan Waldmann: Lineare Algebra 1. Die Grundlagen für Studierende der Mathematik und Physik.
    Springer-Verlag Heidelberg, New York, 2017.
    [MR] [Zbl06654263] [Errata]
  3. Stefan Waldmann: Topology. An Introduction.
    Springer-Verlag Heidelberg, New York, 2014.
    [MR3308923] [Zbl06339551] [Errata]
  4. Martin Bordemann, Kurusch Ebrahimi-Fard, Abdenacer Makhlouf, Martin Schlichenmaier, Stefan Waldmann, (eds.): Special issue: Selected papers based on the presentations at the commemorative colloquium dedicated to Nikolai Neumaier, LMIA, Université de Haute-Alsace, Mulhouse, France, June 16-18, 2011.
    Travaux Mathématiques 20. University of Luxembourg, Faculty of Science, Technology and Communication. 2012, 231 pages.
    [MR3059581] [Zbl1253.00017]
  5. Stefan Waldmann: Poisson-Geometrie und Deformationsquantisierung. Eine Einführung.
    Springer-Verlag Heidelberg, Berlin, New York, 2007.
    [Zbl1139.53001] [Errata]

Published articles (anti-chronological)

  1. Chiara Esposito, Jonas Schnitzer, Stefan Waldmann: An Universal Construction of Universal Deformation Formulas, Drinfel'd Twists and their Positivity.
    Pacific J. Math. 291 (2017), 319--358 pages.
    [Abstract] [Postscript] [PDF] [MR3703446] [Zbl06781314]
  2. Chiara Esposito, Paul Stapor, Stefan Waldmann: Convergence of the Gutt Star Product.
    J. Lie Theory 27 (2017), 579--622.
    [Abstract] [Postscript] [PDF] [MR3589272] [Zbl06731683]
  3. Thorsten Reichert, Stefan Waldmann: Classification of Equivariant Star Products on Symplectic Manifolds
    Lett. Math. Phys. 106 (2016), 675–692 pages.
    [Abstract] [Postscript] [PDF] [MR3490952] [Zbl1341.53123]
  4. Gandalf Lechner, Stefan Waldmann: Strict deformation quantization of locally convex algebras and modules.
    J. Geom. Phys. 99 (2016), 111–144 pages.
    [Abstract] [Postscript] [PDF] [MR3428360] [Zbl1330.53117]
  5. Frank Keller, Stefan Waldmann: Deformation Theory of Courant Algebroids via the Rothstein Algebra.
    J. Pure and Appl. Alg. 219 (2015), 3391–3426.
    [Abstract] [Postscript] [PDF] [MR3320226] [Zbl1315.53103]
  6. Stefan Waldmann: A nuclear Weyl algebra.
    J. Geom. Phys. 81 (2014), 10-46 pages.
    [Abstract] [Postscript] [PDF] [MR3194213] [Zbl1287.53073]
  7. Svea Beiser, Stefan Waldmann: Fréchet algebraic deformation quantization of the Poincaré disk.
    Crelle's J. reine angew. Math. 688 (2014), 147-207.
    [Abstract] [Postscript] [PDF] [MR3176618] [Zbl1290.53079]
  8. Stefan Jansen, Nikolai Neumaier, Gregor Schaumann, Stefan Waldmann: Classification of Invariant Star Products up to Equivariant Morita Equivalence on Symplectic Manifolds.
    Lett. Math. Phys. 100 (2012), 203-236.
    [Abstract] [Postscript] [PDF] [MR2912481] [Zbl1251.53057]
  9. Henrique Burzstyn, Vasiliy Dolgushev, Stefan Waldmann: Morita equivalence and characteristic classes of star products.
    Crelle's J. reine angew. Math. 662 (2012), 95-163.
    [Abstract] [Postscript] [PDF] [MR2876262] [Zbl1237.53080]
  10. Simone Gutt, Stefan Waldmann: Involutions and Representations for Reduced Quantum Algebras.
    Adv. Math. 224 (2010), 2584-2644.
    [Abstract] [Postscript] [PDF] [MR2652217] [Zbl1236.53070]
  11. Florian Becher, Nikolai Neumaier, Stefan Waldmann: Deformation Quantization of a Class of Open Systems.
    Lett. Math. Phys. 92 (2010), 155-180.
    [Abstract] [Postscript] [PDF] [MR2645824] [Zbl1193.53181]
  12. Martin Bordemann, Nikolai Neumaier, Stefan Waldmann, Stefan Weiß: Deformation quantization of surjective submersions and principal fibre bundles.
    Crelle's J. reine angew. Math. 639 (2010), 1--38
    [Abstract] [Postscript] [PDF] [MR2608189] [Zbl05687061]
  13. Nikolai Neumaier, Stefan Waldmann: Deformation Quantization of Poisson Structures Associated to Lie Algebroids.
    SIGMA 5 (2009), 074.
    [Abstract] [Postscript] [PDF] [MR2529173] [Zbl05708863]
  14. Daniel Kaschek, Nikolai Neumaier, Stefan Waldmann: Complete Positivity of Rieffel's Deformation Quantization.
    J. Noncommut. Geom. 3 (2009), 361--375.
    [Abstract] [Postscript] [PDF] [MR2511634] [Zbl05578950]
  15. Jakob G. Heller, Nikolai Neumaier, Stefan Waldmann: A C*-Algebraic Model for Locally Noncommutative Spacetimes.
    Lett. Math. Phys. 80 (2007), 257-272.
    [Abstract] [Postscript] [PDF] [MR2333512] [Zbl1127.53075]
  16. Svea Beiser, Hartmann Römer, Stefan Waldmann: Convergence of the Wick Star Product.
    Commun. Math. Phys. 272 (2007), 25-52.
    [Abstract] [Postscript] [PDF] [MR2291800] [Zbl05237981]
  17. Dorothea Bahns, Stefan Waldmann: Locally Noncommutative Space-Times.
    Rev. Math. Phys. 19 (2007), 273-305.
    [Abstract] [Postscript] [PDF] [MR2316535] [Zbl1127.81027]
  18. Frank Keller, Stefan Waldmann: Formal Deformations of Dirac Structures.
    J. Geom. Phys. 57 (2007), 1015-1036.
    [Abstract] [Postscript] [PDF] [MR2275207] [Zbl1112.58018]
  19. Stefan Jansen, Stefan Waldmann: The H-Covariant Strong Picard Groupoid.
    J. Pure Appl. Alg. 205 (2006), 542-598.
    [Abstract] [Postscript] [PDF] [MR2210219] [Zbl1108.53056]
  20. Henrique Bursztyn, Stefan Waldmann: Completely positive inner products and strong Morita equivalence.
    Pacific J. Math. 222 (2005), 201-236.
    [Abstract] [Postscript] [PDF] [MR2225070] [Zbl1111.53071]
  21. Henrique Bursztyn, Stefan Waldmann: Hermitian star products are completely positive deformations.
    Lett. Math. Phys. 72 (2005), 143-152.
    [Abstract] [Postscript] [PDF] [MR2154860] [Zbl1081.53078]
  22. Stefan Waldmann: States and representations in deformation quantization.
    Rev. Math. Phys. 17 (2005), 15--75.
    [Abstract] [Postscript] [PDF] [MR2130623] [Zbl1138.53316]
  23. Stefan Waldmann: The Picard groupoid in deformation quantization.
    Lett. Math. Phys. 69 (2004), 223-235.
    [Abstract] [Postscript] [PDF] [MR2104445] [Zbl1065.53070]
  24. Henrique Bursztyn, Stefan Waldmann: Bimodule deformations, Picard groups and contravariant connections.
    K-Theory 31 (2004), 1-37.
    [Abstract] [Postscript] [PDF] [MR2050877] [Zbl1054.53101]
  25. Pierre Bieliavsky, Martin Bordemann, Simone Gutt, Stefan Waldmann: Traces for star products on the dual of a Lie algebra.
    Rev. Math. Phys. 15 (2003), 425-445.
    [Abstract] [Postscript] [PDF] [MR1993787] [Zbl1129.53305]
  26. Nikolai Neumaier, Stefan Waldmann: Morita equivalence bimodules for Wick type star products.
    J. Geom. Phys. 47 (2003), 177-196.
    [Abstract] [Postscript] [PDF] [MR1991472] [Zbl1091.53063]
  27. Martin Bordemann, Nikolai Neumaier, Markus J. Pflaum, Stefan Waldmann: On representations of star product algebras over cotangent spaces on Hermitian line bundles.
    J. Funct. Anal. 199 (2003), 1--47.
    [Abstract] [Postscript] [PDF] [MR1966822] [Zbl1038.53087]
  28. Stefan Waldmann: Morita equivalence of Fedosov star products and deformed Hermitian vector bundles.
    Lett. Math. Phys. 60 (2002), 157-170.
    [Abstract] [Postscript] [PDF] [MR1916663] [Zbl1009.53063]
  29. Henrique Bursztyn, Stefan Waldmann: The Characteristic Classes of Morita Equivalent Star Products on Symplectic Manifolds.
    Commun. Math. Phys. 228 (2002), 103-121.
    [Abstract] [Postscript] [PDF] [MR1911250] [Zbl1036.53068]
  30. Stefan Waldmann: A Remark on the Deformation of GNS Representations of *-Algebras.
    Rep. Math. Phys. 48 (2001), 389-396.
    [Abstract] [Postscript] [PDF] [MR1873976] [Zbl1016.46034]
  31. Henrique Bursztyn, Stefan Waldmann: Algebraic Rieffel Induction, Formal Morita Equivalence and Applications to Deformation Quantization.
    J. Geom. Phys. 37 (2001), 307-364.
    [Abstract] [Postscript] [PDF] [MR1811148] [Zbl1039.46052]
  32. Henrique Bursztyn, Stefan Waldmann: *-Ideals and Formal Morita Equivalence of *-Algebras.
    Int. J. Math. 12 (2001), 555-577.
    [Abstract] [Postscript] [PDF] [MR1843866] [Zbl1111.46303]
  33. Henrique Bursztyn, Stefan Waldmann: Deformation Quantization of Hermitian Vector Bundles.
    Lett. Math. Phys. 53 (2000), 349-365.
    [Abstract] [Postscript] [PDF] [MR1818108] [Zbl0982.53073]
  34. Stefan Waldmann: Locality in GNS Representations of Deformation Quantization.
    Commun. Math. Phys. 210 (2000), 467-495.
    [Abstract] [Postscript] [PDF] [MR1776841] [Zbl0976.81019]
  35. Martin Bordemann, Hans-Christian Herbig, Stefan Waldmann: BRST Cohomology and Phase Space Reduction in Deformation Quantization.
    Commun. Math. Phys. 210 (2000), 107-144.
    [Abstract] [Postscript] [PDF] [MR1748172] [Zbl0961.53046]
  36. Martin Bordemann, Nikolai Neumaier, Stefan Waldmann: Homogeneous Fedosov star products on cotangent bundles II: GNS representations, the WKB expansion, traces, and applications.
    J. Geom. Phys. 29 (1999), 199-234.
    [Abstract] [Postscript] [PDF] [MR1670009] [Zbl0989.53060]
  37. Martin Bordemann, Hartmann Römer, Stefan Waldmann: A Remark on Formal KMS States in Deformation Quantization.
    Lett. Math. Phys. 45 (1998), 49--61.
    [Abstract] [Postscript] [PDF] [MR1631664] [Zbl0951.53057]
  38. Martin Bordemann, Nikolai Neumaier, Stefan Waldmann: Homogeneous Fedosov Star Products on Cotangent Bundles I: Weyl and Standard Ordering with Differential Operator Representation.
    Commun. Math. Phys. 198 (1998), 363-396.
    [Abstract] [Postscript] [PDF] [MR1668901] [Zbl0968.53056]
  39. Martin Bordemann, Stefan Waldmann: Formal GNS Construction and States in Deformation Quantization.
    Commun. Math. Phys. 195 (1998), 549-583.
    [Abstract] [Postscript] [PDF] [MR1641003] [Zbl0989.53057]
  40. Stefan Waldmann: A Remark on Non-equivalent Star Products via Reduction for CPn.
    Lett. Math. Phys. 44 (1998), 331-338.
    [Abstract] [Postscript] [PDF] [MR1627891] [Zbl0924.58119]
  41. Martin Bordemann, Stefan Waldmann: A Fedosov Star Product of Wick Type for Kähler Manifolds.
    Lett. Math. Phys. 41 (1997), 243-253.
    [Abstract] [Postscript] [PDF] [MR1463874] [Zbl0892.53028]
  42. Martin Bordemann, Michael Brischle, Claudio Emmrich, Stefan Waldmann: Subalgebras with converging star products in deformation quantization: An algebraic construction for CPn.
    J. Math. Phys. 37 (1996), 6311-6323.
    [Abstract] [Postscript] [PDF] [MR1419171] [Zbl0923.58024]
  43. Martin Bordemann, Michael Brischle, Claudio Emmrich, Stefan Waldmann: Phase Space Reduction for Star Products: An Explicit Construction for CPn.
    Lett. Math. Phys. 36 (1996), 357-371.
    [Abstract] [Postscript] [PDF] [MR1384642] [Zbl0849.58035]

Proceedings (anti-chronological)

  1. Stefan Waldmann: Recent developments in deformation quantization.
    In: Finster, F., Kleiner, J., Röken, C., Tolksdorf, J. (Eds.): Quantum mathematical physics. 421-439. Birkhäuser, Cham, Heidelberg, New York, 2016. A bridge between mathematics and physics. Selected papers based on the presentations at the international conference, Regensburg, Germany, September 29 - October 2, 2014.
    [Abstract] [Postscript] [PDF] [MR3496889] [Zbl1338.81253]
  2. Stefan Waldmann: Fréchet-algebraic deformation quantizations.
    J. Phys. Conf Ser. 532 (2014), 012027. Contributions to the Proceedings of the conference 3Quantum: Algebra Geometry Information (QQQ Conference 2012).
    [MR] [Zbl]
  3. Henrique Bursztyn, Stefan Waldmann: Strong and Covariant Morita equivalences in Deformation Quantization.
    Travaux mathématiques 20 (2012), 121-143. Contributions to the Proceedings of the Commemorative Colloquium dedicated to Nikolai Neumaier. Mulhouse, June 2011.
    [MR3014186] [Zbl]
  4. Henrique Bursztyn, Stefan Waldmann: Classifying Morita Equivalent Star Products.
    Clay Mathematics Proceedings 16 (2012), 1-17. Contribution to the Proceedings of the 3rd Annual Luis Santaló Winter School–CIMPA Research School held at the Universidad de Buenos Aires, Buenos Aires, July 26–August 6, 2010.
    [MR2986859] [Zbl1323.53088]
  5. Stefan Waldmann: Morita Theory in Deformation Quantization.
    Bull. Braz. Math. Soc. New Series 42 (2012), 831-852. Contribution to the Proceedings of the Poisson 2010 conference held in Rio de Janeiro, July 2010.
    [Abstract] [Postscript] [PDF] [MR2861787] [Zbl1256.53057]
  6. Michel Cahen, Simone Gutt, Stefan Waldmann: Symplectic Connections of Ricci Type and Star Products.
    In: Cattaneo, A. S., Giaquinto, A., Xu, P. (Eds.): Higher Structures in Geometry and Physics. 93--110. Birkhäuser, Basel, Boston, Berlin, 2010. Contribution to the Proceedings of the conference "Higher Structures in Geometry and Physics: Conference in honor of Murray Gerstenhaber's 80th and Jim Stasheff's 70th birthdays", 2007.
    [Abstract] [Postscript] [PDF] [MR2762541] [Zbl1220.53102]
  7. Stefan Waldmann: Covariant Strong Morita Theory of Star Product Algebras.
    In: Caenepeel, S., Fuchs, J., Gutt, S., Schweigert, C., Stolin, A., and Van Oystaeyen, F. (Eds.): Noncommutative Structures in Mathematics and Physics. 245--258. Universa Press, Wetteren, Belgium, 2010. Contributions to the Proceedings of the NoMap conference, 2008.
    [Abstract] [Postscript] [PDF] [MR2742744] [Zbl1195.81083]
  8. Stefan Waldmann: Positivity in Rieffel's strict deformation quantization.
    In: Pavel Exner (Ed.): XVIth International Congress on Mathematical Physics. 509--513. World Scientific, New Jersey, London, Singapore, 2010. Contribution to the Proceedings of the XVIth International Congress on Mathematical Physics, Prague, 3--8 August 2009.
    [Abstract] [Postscript] [PDF] [MR2730817] [Zbl1203.81086]
  9. Stefan Waldmann: Noncommutative field theories from a deformation point of view.
    In: Bertfried Fauser, Jürgen Tolksdorf, Eberhard Zeidler (Eds.): Quantum Field Theory. Competitive Models. 117--135. Birkhäuser Verlag, Basel, Boston, 2009. Contribution to the Proceedings of the Leipzig Conference "Recent Developments in Quantum Field Theory".
    [Abstract] [Postscript] [PDF] [MR2742752] [Zbl1163.53060]
  10. MR2742752 Stefan Waldmann: Locally noncommutative space-times.
    In: Guiseppe Dito, Jiang-Hua Lu, Yoshiaki Maeda, and Alan Weinstein (Eds.): Poisson Geometry in Mathematics and Physics. Contemporary Mathematics 450, 301-311. American Mathematical Society, Providence, Rhode Island (2008). Contribution to the Proceedings of the conference Poisson 2006.
    [Postscript] [PDF] [MR2397631] [Zbl05310320]
  11. Jakob G. Heller, Nikolai Neumaier, Stefan Waldmann: Locally Noncommutative Spacetimes.
    J. Geom. Symmetry Phys. 10 (2007), 9-27. Contribution to the Proceedings for the XXV Workshop on Geometric Methods in Physics, Bialowieza 2006.
    [Postscript] [PDF] [MR2380047] [Zbl1137.53350]
  12. Stefan Waldmann: The Covariant Picard Groupoid in Differential Geometry.
    Int. J. Geom. Methods Mod. Phys. 3 (2006), 641-654.
    Proceedings of the 20th International Workshop on Differential Geometric Methods in Theoretical Mechanics in Ghent, August 2005.
    [Abstract] [Postscript] [PDF] [MR2232877] [Zbl1135.53061]
  13. Henrique Bursztyn, Stefan Waldmann: Induction of Representations in Deformation Quantization.
    In: Yoshiaki Maeda, Nobuyuki Tose, Naoya Miyazaki, Satoshi Watamura, Daniel Sternheimer (Eds.): Noncommutative geometry and physics. World Scientific, Singapore, 65-76 (2005).
    [Abstract] [Postscript] [PDF] [MR2186381] [Zbl]
  14. Stefan Waldmann: Morita Equivalence, Picard Groupoids and Noncommutative Field Theories.
    In: Ursula Carow-Watamura, Yoshiaki Maeda, Satoshi Watamura (Eds.): Quantum Field Theory and Noncommutative Geometry. Lecture Notes in Physics 662, 143-155. Springer-Verlag, Heidelberg, Berlin, New York (2005).
    [Abstract] [Postscript] [PDF] [MR2179181] [Zbl1078.53083]
  15. Stefan Waldmann: Deformation Quantization: Observable Algebras, States and Representation Theory.
    In: Branko Dragovich et al. (Eds.): Proceedings of the 2nd summer school in modern mathematical physics, Kopaonik, Yugoslavia, September 1-12, 2002. Sveske Fizickikh Nauka. Series A: Conferences 16, 83-107. Institute of Physics, Belgrade (2003).
    [Abstract] [Postscript] [PDF] [MR] [Zbl1083.53087]
  16. Stefan Waldmann: On the Representation Theory of Deformation Quantization.
    In: Gilles Halbout (Ed.): Deformation Quantization. IRMA Lectures on Mathematics and Theoretical Physics 1, 107-133. Walter de Gruyter, Berlin, New York (2002).
    [Abstract] [Postscript] [PDF] [MR1914784] [Zbl1014.53055]
  17. Stefan Waldmann: Deformation of Hermitian Vector Bundles and Non-Commutative Field Theory.
    In: Yoshiaki Maeda, Satoshi Watamura (Eds.): Noncommutative Geometry and String Theory. Prog. Theo. Phys. Suppl. 144 (2001), 167--175.
    [Postscript] [PDF] [MR2023855] [Zbl1012.81029 ]
  18. Henrique Bursztyn, Stefan Waldmann: On Positive Deformations of *-Algebras.
    In: Giuseppe Dito, Daniel Sternheimer (Eds.): Conference Moshe Flato 1999. Quantization, Deformations, and Symmetries. Mathematical Physics Studies 22, 69-80. Kluwer Academic Publishers, Dordrecht, Boston, London (2000).
    [Abstract] [Postscript] [PDF] [MR1805905] [Zbl0979.53098]
  19. Martin Bordemann, Hartmann Römer, Stefan Waldmann: KMS States and Star Product Quantization.
    Rep. Math. Phys. 44 (1999), 45-52.
    [Postscript] [PDF] [MR1726119] [Zbl0964.81045]
  20. Martin Bordemann, Stefan Waldmann: Formal GNS Construction and WKB Expansion in Deformation Quantization.
    In: Daniel Sternheimer, John Rawnsley, Simone Gutt (Eds.): Deformation Theory and Symplectic Geometry. Mathematical Physics Studies 20, 315--319. Kluwer Academic Publishers, Dordrecht, Boston, London (1997).
    [Abstract] [Postscript] [PDF] [MR1480731] [Zbl05353715]

Lecture notes and others

  1. Stefan Waldmann: Geometric Wave Equations.
    Lecture notes for the lecture "Wellengleichungen auf Raumzeiten" held in Freiburg 2008/2009. (2013), 273 + vi pages.
    [Abstract] [PDF]
  2. Stefan Waldmann: Representation Theory of *-Algebras.
    Lecture notes for the lecture "Deformationquantisierung und Darstellungstheorie" held in Freiburg 2007/2008 and in Erlangen 2012. Preliminary and uncomplete version (2013), 144 + vi pages.
    [PDF]
  3. Stefan Waldmann: An Introduction to Deformation Quantization.
    Lecture note for the Second Freiburg Summerschool on Theoretical Physics (2002), 31 pages.
    [Postscript] [PDF]
  4. Stefan Waldmann: Eine moderne Methode der Quantisierung: Die Deformationsquantisierung.
    Lecture note for the First Freiburg Summerschool on Theoretical Physics, in german (2001), 32 pages.
    [Postscript] [PDF]

Theses

  1. Stefan Waldmann: Zur Darstellungstheorie in der Deformationsquantisierung.
    Habilitation thesis in physics, Fakultät für Mathematik und Physik, Physikalisches Institut, Albert-Ludwigs-Universität, Freiburg im Breisgau (2003).
  2. Stefan Waldmann: Zur Deformationsquantisierung in der klassischen Mechanik: Observablen, Zustände und Darstellungen.
    Ph. D. thesis in physics, Fakultät für Physik, Albert-Ludwigs-Universität, Freiburg im Breisgau (1999), 190 pages in german.
    [Postscript]
  3. Stefan Waldmann: Ein Sternprodukt für den komplex projektiven Raum und die Fedosov-Konstruktion für Kähler-Mannigfaltigkeiten.
    Diplomarbeit (master thesis) in physics, Fakultät für Physik, Albert-Ludwigs-Universität, Freiburg im Breisgau (1995), 97 pages in german.
    [Gzipped Postscript]

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