Some of Walter Neumann's (P)reprints

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Expository articles and books

Topology of hypersurface singularities. Appeared in "Erich Kaehler -- Mathematische Werke, Mathematical works", R. Berndt and O. Riemenschneider eds., (de Gruyter 2003), 727--736. .pdf
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 (750K) or .pdf (2M).

Research papers

Minimal singularities are Lipschitz normally embedded. With Helge Møller Petersen and Anne Pichon, New Version: July 2018 arXiv.org:1503.03301
A characterization of Lipschitz normally embedded surface singularities. With Helge Møller Petersen and Anne Pichon. July 2018 arXiv.org:1806.11240
Tangent cones of Lipschitz normally embedded sets are Lipschitz normally embedded. Appendix by Anne Pichon and Walter D. Neumann. Internat. Math. Research Notices, https://doi.org/10.1093/imrn/rnx290 arXiv.org:1705.00038
Lipschitz geometry does not determine embedded topological type. With Anne Pichon. Published "Trends in Mathematics" (Birkhauser 2016) .pdf
Intercusp geodesics and the invariant trace field of hyperbolic 3-manifolds. With Anastasiia Tsvietkova.> Published, Proc. AMS. Volume 144, Number 2, February 2016. arxiv.org:1402.5582
Choking horns in Lipschitz Geometry of Complex Algebraic Varieties. Appendix by Walter D Neumann. L. Birbrair, Alexandre Fernandes, Vincent Grandjean, Donal O'Shea, JGA, Vol 24, Issue 4, https://doi.org/10.1007/s12220-013-9405-x). .pdf
Lipschitz geometry of complex curves. With Anne Pichon. Appeared in Journal of Singularities 10 (2014), 225-234. .pdf
Lipschitz geometry of complex surfaces: analytic invariants and equisingularity. With Anne Pichon. This July 2014 version is a major revision of the earlier version posted on the arXiv. .pdf
The thick-thin decomposition and the bilipschitz classification of normal surface singularities. With Lev Birbrair and Anne Pichon, appeared in Acta Math. 212 (2014), 199-256 .pdf
Volume bounds for generalized twisted torus links. With Abhijit Champanerkar, David Futer, Ilya Kofman, Jessica Purcell, appeared in Math. Res. Lett. 18 (2011), 1097-1120. .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, appeared in J. reine angew. Math. (Crelle journal), Issue 669 (2012), 101-120 .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
Homological action of the modular group on some cubic moduli spaces. With W. Goldman. Appeared in Math Res Letters 12 (2005), 575-591. .pdf 560K
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
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.) .pdf
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) .pdf
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

Research Monographs

U. Karras, M. Kreck, W.D. Neumann, E. Ossa, Cutting and Pasting of Manifolds; SK-Groups Publish or Perish, Boston, MA, 1973 pdf
S^1-actions and the \alpha-invariant of their involutions. Bonner Mathematische Schriften 44, 1969 (my dissertation). pdf (34Mb)

Angelo Di Pasquale's Thesis

Links and Complements of Arrangements of Complex Projective Plane Algebraic Curves

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