I am a professor in the
Department of
Mathematics, Statistics, and Computer Science at
the University of Illinois at
Chicago.
My research interests include Teichmüller theory, geometric
structures, representations of surface groups in Lie groups, and complex geometry.

Computer experiments and visualizations are an important component of my research. I use these tools to guide my theoretical work and to present my results.

- Coarse and fine geometry of the Thurston metric (with Anna Lenzhen, Kasra Rafi, and Jing Tao). Submitted. New!
- Polynomial cubic differentials and convex polygons in the projective plane (with Michael Wolf).

Geometric and Functional Analysis 25 (2015), no. 6, 1734-1798.

doi:10.1007/s00039-015-0344-5 - Skinning maps are finite-to-one.

Acta Mathematica 215 (2015), no. 1, 55-126.

doi:10.1007/s11511-015-0129-6 - Holonomy limits of complex projective structures.

Submitted. - Grafting lines fellow travel Teichmüller geodesics (with Young-Eun Choi and Kasra Rafi).

International Mathematics Research Notices 2012 (2012), 2445-2492.

doi:10.1093/imrn/rnr104 - Bers slices are Zariski dense (with Richard Kent).

Journal of Topology 2 (2009), no. 2, 373-379.

doi:10.1112/jtopol/jtp014 - Survey: Complex projective structures.

In Handbook of Teichmüller Theory, Volume II. Ed. Athanase Papadopoulos. EMS, 2009.

doi:10.4171/055 - Slicing, skinning, and grafting (with Richard Kent).

American Journal of Mathematics 131 (2009), no. 5, 1419-1429.

doi:10.1353/ajm.0.0072 - Projective structures, grafting, and measured laminations (with Michael Wolf).

Geometry & Topology 12 (2008), no. 1, 351-386.

doi:10.2140/gt.2008.12.351 - Distribution of intersection lengths of a random geodesic with a geodesic lamination (with Martin Bridgeman).

Ergodic Theory and Dynamical Systems 27 (2007), no. 4, 1055-1072.

doi:10.1017/S0143385706001040. - The Schwarzian derivative and measured laminations on Riemann surfaces.

Duke Mathematical Journal 140 (2007), no. 2, 203-243.

doi:10.1215/S0012-7094-07-14021-3. - Grafting, pruning, and the antipodal Map on Measured Laminations.

The PDF linked here is an updated version of the paper published in J. Diff. Geom. 74 (2006), 93-118. It includes the correction that is the subject of this erratum.

Journal link: article / erratum

- Experiments with skinning maps (with Autumn Kent).
- Geometry of compact complex manifolds associated to generalized quasi-Fuchsian representations (with Andrew Sanders).
- Anosov representations, locally homogeneous complex manifolds, and deformation theory (with Andrew Sanders).
- Rays of conformally thick convex real projective surfaces (with Michael Wolf).

I also have a YouTube channel.

The links in this list go to gallery pages, most of which contain some explanation of the mathematical background:

- The PML Visualization Project (with François Guéritaud) Updated June 2016.

- Fence conjecture for polygonal affine spheres

- Simple geodesics and the Birman-Series set

- Bug on Notes of Thurston (with Jeff Brock)

- Thurston's Jewel (with Jeff Brock)

- CP
^{1}structures and Bers slices, an overview with links to several galleries, including: - Limit sets

- Ray-traced convex hulls of limit sets

- Miscellaneous mathematical images that do not fit into the specialized galleries

- Visualizing PML: Lecture 1 and Lecture 2 (June 30 - July 1, 2016).
- Research lecture series at the ICERM workshop Illustrating Mathematics.
- PDF slides for lecture 1 and slides for lecture 2

- Computing the image of Thurston's skinning map (Sep 17, 2013).
- Research lecture at the ICERM workshop Exotic Geometric Structures.

- Osculation in complex projective and hyperbolic structures (Aug 10, 2012).
- Survey lecture at GEAR Retreat 2012.

- Shapes of polygons (Mar 3, 2007).
- Lecture for undergraduates at SUMS 2007.

**My Github hosts all recent projects**- Miscellaneous software projects (before I switched to Github)
- Bear - A tool for studying Bers slices of punctured tori (at Sourceforge) (2004-2007)
- Random chords applet (2006)

I am a co-founder and administrator of the Mathematical Computing Laboratory, an organization supporting undergraduate research in mathematics at UIC.

- UIC
- Spring 2017 - Math 569: Representations of Surface Groups [Tue & Thu 3:30-4:45pm]
- Fall 2016 - Math 180: Calculus I
- Fall 2016 - Math 320: Linear Algebra I
- Spring 2016 - Math 535: Complex Analysis I
- Fall 2015 - Math 445: Introduction to Topology I
- Fall 2015 - Math 210: Calculus III (my section is managed through Blackboard)
- Fall 2014 - Math 550: Differentiable Manifolds II
- Fall 2014 - Math 180: Calculus I
- Spring 2014 - MCS 481: Computational Geometry
- Spring 2014 - Math 180: Calculus I
- Spring 2013 - Math 570: Topics in Teichmüller Theory and Geometric Structures
- Spring 2013 - Math 215: Introduction to Advanced Mathematics
- Spring 2012 - MCS 481: Computational Geometry
- Fall 2011 - Math 180: Calculus I
- Spring 2011 - MCS 481: Computational Geometry
- Fall 2010 - Math 442: Differential Geometry of Curves and Surfaces
- Spring 2010 - Math 535: Complex Analysis I
- Fall 2009 - Math 180: Calculus I
- Spring 2009 - Math 442: Differential Geometry of Curves and Surfaces
- Fall 2008 - Math 210: Calculus III

- Brown
- Spring 2008 - Math 520: Linear Algebra
- Spring 2007 - Math 18: Intermediate Calculus (Multivariable)
- Spring 2006 - Math 104: Fundamental Problems of Geometry
- Fall 2005 - Math 52: Linear Algebra

- Harvard
- Fall 2002 - Freshman Seminar: Dynamics, Geometry, and Randomness
- Summer 2002 - Tutorial on Groups of Möbius Transformations
- Spring 2002 - QR26 - Decisions, Games, and Negotiation
- Summer 2001 - Tutorial on Hyperbolic Geometry

- Math at Brown (2005-2008, Tamarkin Assistant Professor and NSF Postdoc)
- Math at Rice (2004-2005, NSF Postdoc)
- Math at Harvard (1999-2004, PhD student)
- Math and physics at Penn State (Undergraduate)
- Pennsbury School District (K-12)

- Is your web page still readable if you remove the CSS?

(The link is a bookmarklet, so you can try it on other pages.) - I am a user of GNU/Linux and an advocate of free and open source software.

**Email:**david@dumas.io-
**Office:**503 Science and Engineering Offices (SEO) -
**Full mailing address:**

Department of Mathematics, Statistics, and Computer Science

University of Illinois at Chicago

322 Science and Engineering Offices (M/C 249)

851 S. Morgan Street

Chicago, IL 60607-7045

- Public key