Sigurd Angenent, Joost Hulshof, Hiroshi Matano, The radius of vanishing bubbles in equivariant harmonic map flow from D2 to S2, (17 pages, march 2006) PDF PS
Sigurd Angenent, Self-intersecting Geodesics and Entropy of the Geodesic Flow, (4 pages, december 2005) PDF
Sigurd Angenent, Dan Knopf, Precise asymptotics in the Ricci flow neck pinch. (53 pages, november 2005) PDF
Sigurd Angenent, Curve Shortening and the topology of closed geodesics on surfaces, Annals of Mathematics, 162, (2005) no.3 p.1185-1239 PS, PDF
Sigurd Angenent, Joost Hulshof, Singularities at t=∞ in Equivariant Harmonic Map Flow. in “Geometric Evolution Equations,” Shu-Cheng Chang, Ben Chow, Sun-Chin Chu, Chang-Shou Lin, editors. Contemporary Mathematics 367, American Mathematical Society, January 2005 PDF
Sigurd Angenent, Dan Knopf, An example of neckpinching for Ricci flow on Sn+1. Mathematical Research Letters 11 (2004), no. 4, 493--518. PDF
Sigurd Angenent, Don G.Aronson, The focusing problem for the Eikonal Equation. Journal of Evolution Equations 3 (2003), no. 1, 137–151. PDF
S.B. Angenent, D.G. Aronson, S.I. Betelu, J.S. Lowengrub, Focusing of an elongated hole in porous medium flow. Physica D 151 (2001), 228--252.
Sigurd Angenent, Don G.Aronson, Non axial self-similar hole filling solutions to the porous medium equation, Journal of the AMS 14 (2001) pp.737-782. PDF
Sigurd Angenent, Don G.Aronson, Santiago Betelú, Renormalization study of two-dimensional convergent solutions of the porous medium equation, Physica D 138 (2000), pp.344--359. PDF
Sigurd Angenent, Jan Bouwe van den Berg, Rob van der Vorst , Contact and noncontact type Hamiltonian systems generated by second order Lagrangians, to appear, Ergodic Theory and Dynamical Systems, 2006/7. PDF
Sigurd Angenent, Rob van der Vorst, , A priori estimates and renormalized Morse indices of solutions of an elliptic system, Ann. Inst. H. Poincaré Anal. Non Linéaire, PS PDF
Sigurd Angenent, Marek Fila, Interior gradient blow-up in a semilinear parabolic equation, Journal of Differential and Integral Equations 9 (1996), no. 5, 865--877. PDF
Sigurd Angenent, Constructions with analytic semigroups and abstract exponential decay results for eigenfunctions, (proceedings of the conference in honor of H.Amann's 60th birthday Birkhauser Verlag) PS, PDF
Sigurd Angenent, A variational interpretation of Melnikov's function and exponentially small separatrix splitting, (Proceedings of a conference on Symplectic Geometry held in Warwick, UK, 1990, drawings are missing, sorry.) PDF , PS
Sigurd Angenent, A remark on the topological entropy and invariant circles of an area preserving twistmap, (Proceedings of an IMA workshop on Monotone twist maps and their applications, 5 pages) PDF
Sigurd Angenent, Inflection points, extatic points and Curve Shortening, (Proceedings of the NATO workshop on Hamiltonian systems with 3 or more degrees of freedom, S'Agarro, 1995; 11 pages.) PS, PDF
Sigurd Angenent, Eric Pichon, and Allen Tannenbaum, Mathematical Methods of Medical Imaging, to appear, Bulletin of the AMS, (2006). 32 pages, PDF
Marc Niethammer, Allen Tannenbaum, and Sigurd Angenent, Dynamic Active Contours for Visual Tracking, IEEE Transactions on Automatic Control, April 2006, vol 51 issue 4 pages 562—579. PDF. abstract
— PDF slides of a talk I gave for a non engineering audience in Groningen, 2005 and some animations related to the Minimizing Flows for the Monge-Kantorovich Problem of the following paper:
Steve Haker, Sigurd Angenent, Allen Tannenbaum, Minimizing Flows for the Monge-Kantorovich Problem, (June 2002; To appear in SIAM Journal of Math Analysis) gzipped postscript.
Steve Haker, Sigurd Angenent, Allen Tannenbaum, Ron Kikinis, On Area Preserving Mappings of Minimal Distortion, gzipped postscript.
Steve Haker, Sigurd Angenent, Allen Tannenbaum, Ron Kikinis, Angle-Preserving Flattening Maps and the 3D Visualization of Colon CT Images,(A similar paper appeared as " Nondistorting Flattening Maps and the 3-D Visualization of Colon CT Images, IEEE Transactions on Medical Imaging, 19, pp.665-670, 2000.") PDF
Steve Haker, Sigurd Angenent, Allen Tannenbaum, Ron Kikinis, Laplace-Beltrami Operator and Brain surface flattening, IEEE Transactions on Medical Imaging,18, pp.700-711, 1999. PDF (1.6Mb)