Some of Walter Neumann's (P)reprints

Expository articles

• Topology of hypersurface singularities. Appeared in "Erich Kaehler -- Mathematische Werke, Mathematical works", R. Berndt and O. Riemenschneider eds., (de Gruyter 2003), 727--736. .ps
• Notes on Geometry and 3-Manifolds, with appendix by Paul Norbury. Appeared in Low Dimensional Topology, B\"or\"oczky, Neumann, Stipsicz, Eds., Bolyai Society Mathematical Studies 8 (1999), 191--267. .pdf
• A Short Course in Geometric Group Theory. With M. Shapiro Notes for the ANU Workshop January/February 1996. .ps, Topology atlas version.
• Lectures on Seifert Manifolds. Mark Jankins and Walter D Neumann Brandeis Lecture Notes 2, March 1983 .djvu

Research papers

• The thick-thin decomposition and the bilipschitz classification of normal surface singularities. With Lev Birbrair and Anne Pichon.  .pdf
• Volume bounds for generalized twisted torus links. With Abhijit Champanerkar, David Futer, Ilya Kofman, Jessica Purcell. To appear in MRL   .pdf
• Realizing arithmetic invariants of hyperbolic 3-manifolds, appeared in "Interactions Between Hyperbolic Geometry, Quantum Topology and Number Theory", Contemporary Math 541 (AMS 2011), 233-246  .pdf
• Quasi-isometric classification of non-geometric 3-manifold groups. With Jason Behrstock, to appear in Crelle  .pdf
• Principal analytic link theory in homology sphere links. With A Nemethi and A. Pichon, appeared in "Proceedings Lib60ber," Contemporary Math. 538 (Amer. Math. Soc. 2011), 377--387  .pdf
• Quasi-isometry of a class of some higher dimensional right angled Artin groups. With Jason Behrstock and Tadeusz Januszkiewicz, appeared in Groups, Geometry, and Dynamics 4 (2011) 681--692.  .pdf
• On Leighton's graph covering theorem, appeared in Groups, Geometry, and Dynamics 4 (2011) 863--872  .pdf
• Separating sets, metric tangent cone and applications for complex algebraic germs. With Lev Birbrair and Alexandre Fernandes, appeared in Selecta Math. 16 (2010) 377-391  .pdf
• On normal embedding of complex algebraic surfaces. With Lev Birbrair and Alexandre Fernandes, appeared in "Real and Complex Singularities," London Math Soc. Lecture Notes 380 (2010), 17--22.  .pdf
• $\mu$-constancy does not imply constant bi-Lipschitz type. With Lev Birbrair and Alexandre Fernandes. August 2008, now incorporated into the above paper "Separating sets ..."  .pdf
• The 2-generalized knot group determines the knot. With Sam Nelson. Appeared in Commun. Contemp. Math. 10 (2008), 843-847  .pdf
• Bi-Lipschitz geometry of surface singularities. With Lev Birbrair and Alexandre Fernandes. Appeared in Geom. Ded. 129 (2009), 259-267   .pdf
• The end curve theorem for normal complex surface singularities. With J. Wahl. J. European Math. Soc. 12 (2010), 471-503   pdf
• Commensurability and QI classification of free products of finitely generated abelian groups. With Jason Behrstock and Tadeusz Januszkiewicz, Appeared in Proc. AMS 137 (2009), 811-813.  .pdf
• Bi-Lipschitz geometry of weighted homogeneous surface singularities. With Lev Birbrair and Alexandre Fernandes. April 2007, updated Oct 2007, appeared in Math. Ann. 342 (2008), 139-144.  .pdf
• Positive generation implies the Hanna Neumann Conjecture. (This is a one paragraph proof of the result of the title. No publication planned.)  .pdf
• Quasi-isometric classification of graph manifold groups. With Jason Behrstock. A mildly revised version appeared in Duke Math. J. 141 (2008), 217--240  .pdf 560K
• Graph 3-Manifolds, splice diagrams, singularities. (Notes for a short course in Trieste August 2005, appeared in "Singularity Theory" World Sci. Pub. 2007, 231--238.)   .pdf 135K
• Non-isomorphism of categories of algebras. Student paper accepted by Comment. Math. Univ. Carol. in 1968, but lost during the military/political upheavals that year in Prague. I found my long-lost carbon copy while moving office in July 2005. Typescript retyped into TeX: pdf.
• Singularities of splice type as universal abelian covers With J. Wahl. (July 04)  Geometry and Topology 9 (2005), 699-755
• Complex surface singularities with homology sphere links With J. Wahl.  Geometry and Topology 9 (2005), 757-811
• Extended Bloch group and the Cheeger-Chern-Simons class   Geometry and Topology 8 (2004), 413-474
• Action of the automorphism group of $x^2+y^2+z^2-xyz-2$ on homology With William M. Goldman. Appeared in Math. Res. Letters 12 (2005), 575--591  .pdf 310K
• The Orevkov invariant of an affine plane curve With Paul Norbury. (appeared in Trans. Amer. Math. Soc. 355 (2003), 519-538.)  .ps 250K
• Universal abelian covers of surface singularities With J. Wahl. (appeared in Trends on Singularities, A. Libgober and M. Tibar, eds. (Birkhäuser Verlag, 2002), 181--190)   .ps 165K
• Universal abelian covers of quotient-cusps With J. Wahl. (appeared in Math. Ann. 326 (2003), 75-93)  .ps 235K
• Rigidity of Coxeter groups and Artin groups With Noel Brady, John McCammond, Bernhard M\"uhlherr. (appeared in Geometriae Dedicata 94 (2002), 91-109)  .ps 290K
• Rational polynomials of simple type With Paul Norbury. (appeared in Pacific J. Math. 204 (2002), 177-208.)  .ps 330K
• Unfolding polynomial maps at infinity With Paul Norbury. (appeared in Math. Annalen 318 (2000), 149-180)  .ps 800K
• Algorithms for polynomials in two variables With P. Wightwick. (appeared in Combinatorial and Computational Algebra, Contemporary Math. 264 (AMS 2000) 219-235)  .ps 290K
• Immersed and virtually embedded pi₁-injective surfaces in graph manifolds  Algebraic and Geometric Topology 1 (2001), 411-426.
• Vanishing cycles and monodromy of complex polynomials With Paul Norbury. (appeared in Duke Math. J. 101 (2000) 487-497)  .pdf
• Computing arithmetic invariants of 3-manifolds With D. Coulson, O.A. Goodman, C.D. Hodgson. (appeared in Experimental Mathematics 9 (2000), 127-152)  .pdf
• Conway polynomial of a fibered solvable link (Appeared in J. Knot Theory and its Ramifications 8 (1999), 505--509)  .ps 120K
• Nontrivial Rational Polynomials in two variables have reducible fibres With Paul Norbury. (appeared in Bulletin Austr. Math. Soc. 58 (1998), 501-503)  .ps 62K
• Hilbert's 3rd problems and invariants of 3-manifolds  Geometry and Topology Monographs 1 (1998), The Epstein Birthday Schrift, paper no. 19, pages 383-411.
• Canonical Decompositions of 3-Manifolds With Gadde A. Swarup.  Geometry and Topology, Vol. 1 (1997) Paper no. 3, pages 21-40.
• Irregular links at infinity of complex affine plane curves (appeared in Quarterly J. Math. Oxford 50 (1999) 301-320)  .ps 240K
• Regular geodesic normal forms in virtually abelian groups With M. Shapiro. (appeared in Bull. Austral. Math. Soc. 55 (1997), 517-519.)  .ps 57K.
• Automatic structures on central extensions With M. Shapiro. (appeared in "Geometric Group Theory Down Under, Proceedings of a special year in Geometric Group Theory, Canberra, Australia, 1996", J. Cossey et al. eds., de Gruyter Verlag 1999, 261-280)  .ps 540K.
• Some examples of hyperbolic groups With G.A. Swarup and C.F. Miller III. (appeared in "Geometric Group Theory Down Under, Proceedings of of a special year in Geometric Group Theory, Canberra, Australia, 1996", J. Cossey et al. eds., de Gruyter Verlag 1999, 195-202)  .ps 129K.
• Bloch invariants of hyperbolic 3-manifolds With Jun Yang. (mildly revised version appeared in Duke Math. J. 98 (1999), 29-59)  .pdf 276K.
• Invariants from triangulations of hyperbolic 3-manifolds With Jun Yang.  Electronic Research Announcements of the Amer. Math. Soc. 1 (2) (1995). Mildly corrected version: .pdf
• Rationality problems for K-theory and Chern-Simons invariants of hyperbolic 3-manifolds With Jun Yang. (Appeared in Enseignement Math\'ematique 41 (1995), 281-296)  .pdf 148K (mildly corrected version)
• Central extensions of word hyperbolic groups With Lawrence Reeves. (appeared in Annals of Math. 145 (1997), 183-192)  Magnus preprint.
• Regular Cocycles and Biautomatic Structures With Lawrence Reeves. (appeared in Internat. J. Alg. Comp. 6 (1996), 313-324.)  .ps 123K.
• Kleinian Groups Generated by Rotations (11/94, appeared in "Groups -- Korea '94" Eds.: Kim/Johnson, Walter de Gruyter Verlag, Berlin - New York, 1995, 251--256.)  .ps 105K.
• Commensurability and virtual fibration for graph manifolds. (appeared in TOPOLOGY 36 (1996) 355-378)  .ps 216K.
• Automatic structures and boundaries for graphs of groups With M. Shapiro.  Magnus preprint, appeared in Internat. J. Alg. and Comp. 4 (1994), 591-616.
• Automatic structures, rational growth and geometrically finite hyperbolic groups With M. Shapiro.  Magnus preprint, appeared in Inv. Math. 120 (1995), 259-287.
• Combinatorics of 3-cycles and the Chern-Simons invariant of hyperbolic 3-manifolds (appeared in "Topology 90, Proceedings of the Research Semester in Low Dimensional Topology at Ohio State" (Walter de Gruyter Verlag, Berlin - New York 1992), 243--272.  .pdf
• Arithmetic of hyperbolic 3-manifolds With Alan Reid. Appeared in "Topology 90, Proceedings of the Research Semester in Low Dimensional Topology at Ohio State" (Walter de Gruyter Verlag, Berlin - New York 1992), 273--310.  .pdf
• On intersections of finitely generated subgroups of free groups Appeared in: Groups--Canberra 1989, Springer Lecture Notes in Mathematics 1456 (1990) 161-170  pdf

• My dissertation, Rheinische Friedrich-Wilhelms Universität, Bonn, 1969

  S^1-actions and the \alpha-invariant of their involutions. Bonner Mathematische Schriften 44 (1969)  pdf (34Mb)