Henry Segerman
Department of Mathematics
Oklahoma State University
Stillwater, OK 74078, USA
Office: 504 Mathematical Sciences
Phone: (405) 744-7746
Email: segerman (at) math (dot) okstate (dot) edu
Teaching
Spring 2016: Geometry and Algorithms in Three-Dimensional Modelling, and Math 2163: Calculus III, Section 012.
Fall 2015: Math 2163: Calculus III, Section 012.
Spring 2015: Math 6323: Algebraic Topology.
Fall 2014:
Math 2163: Calculus III, Section 012, and
Math 5313: Geometric Topology.
Spring 2014: Math 2163: Calculus III, Section 701 (Hono(u)rs).
Fall 2013: Math 2153: Calculus II, Sections 005 and 006.
Papers and preprints
Geometry and Topology
Triangulations of 3-manifolds with essential edges, with Craig D. Hodgson, J. Hyam Rubinstein, and Stephan Tillmann, arXiv:1412.0401 [math.GT] (2015), 30 pages, 14 figures.
Non-geometric veering triangulations, with Craig D. Hodgson and Ahmad Issa, Experimental Mathematics 25 (2016), no. 1, pp. 17-45, 29 pages, 24 figures.
1-efficient triangulations and the index of a cusped hyperbolic 3-manifold, with Stavros Garoufalidis, Craig D. Hodgson and J. Hyam Rubinstein, Geometry & Topology 19 (2015), pp. 2619--2689, 71 pages, 28 figures.
Triangulations of hyperbolic 3-manifolds admitting strict angle structures, with Craig D. Hodgson and J. Hyam Rubinstein, Journal of Topology 5 (2012), no. 5, pp. 887-908, 22 pages, 9 figures.
A generalisation of the deformation variety, Algebraic and Geometric Topology 12 (2012), no. 4, pp. 2179-2244, 66 pages, 26 figures.
Pseudo-developing maps for ideal triangulations I: Essential edges and generalised hyperbolic gluing equations, with Stephan Tillmann, Topology and Geometry in Dimension Three: Triangulations, Invariants, and Geometric Structures (Proceedings of the Jacofest conference), AMS Contemporary Mathematics 560 (2011), pp. 85-102, 18 pages, 8 figures.
Veering triangulations admit strict angle structures, with Craig D. Hodgson, J. Hyam Rubinstein and Stephan Tillmann, Geometry & Topology 15 (2011), pp. 2073-2089, 17 pages, 9 figures.
Incompressible surfaces in handlebodies and boundary compressible 3-manifolds, with J. Nogueira, Topology and its Applications 158 (2011), no. 4, pp. 551-571, 21 pages, 14 figures.
Detection of incompressible surfaces in hyperbolic punctured torus bundles, Geometriae Dedicata 150 (2011), no. 1, pp. 181-232, 52 pages, 25 figures.
On spun-normal and twisted squares surfaces, Proc. Amer. Math. Soc. 137 (2009), pp. 4259-4273, 15 pages, 13 figures.
Mathematical Art and Recreational Mathematics
Visualizing Hyperbolic Honeycombs, with Roice Nelson, arXiv:1511.02851 [math.HO], 33 pages, many figures.
Puzzling the 120-cell, with Saul Schleimer, Notices of the American Mathematical Society 62 (2-15), no. 11, pp. 1309-1316, 8 pages, many figures. A more detailed version is available at arXiv:1310.3549 [math.GT].
Hypernom: Mapping VR Headset Orientation to S^{3}, with Vi Hart, Andrea Hawksley and Marc ten Bosch, Proceedings of Bridges 2015: Mathematics, Music, Art, Architecture, Culture, pp. 387-390, 4 pages, 3 figures.
The Quaternion Group as a Symmetry Group, with Vi Hart, Proceedings of Bridges 2014: Mathematics, Music, Art, Architecture, Culture, pp. 143-150, 8 pages, 8 figures. This paper was republished in The Best Writing on Mathematics 2015, Princeton University Press.
Triple gear, with Saul Schleimer, Proceedings of Bridges 2013: Mathematics, Music, Art, Architecture, Culture, pp. 353-360, 8 pages, 19 figures.
Developing fractal curves, with Geoffrey Irving, Journal of Mathematics and the Arts 7 (2013), no. 3-4, pp. 103-121. 21 pages, 22 figures.
How to print a hypercube, Math Horizons 20 (Feb 2013), issue 3, pp. 5-9, 5 pages, 9 figures.
3D printing for mathematical visualisation, Math. Intell. 34 (2012), no. 4, pp. 56-62, 7 pages, 9 figures. The final publication is available at www.springerlink.com, at this page.
Sculptures in S^{3}, with Saul Schleimer, Proceedings of Bridges 2012: Mathematics, Music, Art, Architecture, Culture, pp. 103-110, 8 pages, 9 figures.
Recent 3D printed sculptures, Hyperseeing 2011 Fall/Winter, 10 pages, 11 figures.
Fractal graphs by iterated substitution, Journal of Mathematics and the Arts (© Taylor and Francis, available online at: http://www.tandfonline.com), 5 (2011), no. 2, pp. 51-70, 20 pages, 20 figures.
The Sunflower Spiral and the Fibonacci metric, Proceedings of Bridges 2010: Mathematics, Music, Art, Architecture, Culture (2010), pp. 483-486, 4 pages, 4 figures.
Autologlyphs, with Paul-Olivier Dehaye, 3 pages, many figures. Mathematical Intelligencer 26 (2004), no. 2, pp. 37-39, and cover art.
100 prisoners and a lightbulb, with Paul-Olivier Dehaye and Daniel Ford, Mathematical Intelligencer 25 (2003), no. 4, pp. 53-61, 9 pages, 3 figures.
My Ph.D. thesis is available here (submitted May 2007). It bears a striking resemblance to the paper "Detection of incompressible surfaces in hyperbolic punctured torus bundles".
I designed the cover art and all illustrations for the book Blast into Math! by my friend Julie Rowlett, published January 2013.
Talks
Slides and notes from some of my talks (see my CV for more):
- 3D Printing in Mathematics, October 2015.
- Hypernom: Mapping VR Headset Orientation to S^{3}, July 2015, Link to video, Link to spherical video.
- Veering Dehn surgery, March 2015.
- Rep-tiles, fractal curves, 3D printing and the 4th dimension, October 2014, Link to video.
- The quaternion group as a symmetry group, August 2014, Link to video.
- Developing fractal curves, August 2014, Link to video.
- Sculpture in four-dimensions, June 2014, Link to video.
- Design of 3D printed mathematical art, June 2014, Link to video.
- Structure on the set of triangulations, June 2014.
- How to make sculptures of 4-dimensional things, April 2014, Link to video.
- Regular triangulations and the index of a cusped hyperbolic 3-manifold, October 2013.
- Puzzling the 120-cell, August 2013, Link to video.
- Triple gear, July 2013, Link to video.
- Fractal curves, 4-dimensional puzzles and unlikely gears, April 2013.
- Fractals and how to make a Sierpinski Tetrahedron, November 2012. The activity following this talk is to build a large Sierpinski tetrahedron from 256 small tetrahedra, which can be made from 128 copies of this page.
- Using Mathematica and Rhinoceros to produce 3D printed mathematical models - workshop materials (last updated October 2015).
- Sculptures in S^{3}, July 2012, Link to video.
- Some Mathematical Sculptures, January 2012.
- Triangulations of hyperbolic 3-manifolds admitting strict angle structures, January 2012.
- A generalisation of the deformation variety, Oct 2010.
- The Sunflower Spiral and the Fibonacci Metric, Jul 2010.
- When is a knot not a knot?, Jan 2010.
- The Mathfest 2009 Poster Image, Mathematical Art, Design and Education in Second Life, Aug 2009.
I also showed a video at the start of the talk and another at the end. - Drawing knots using computers, Jul 2009.
- Extending the deformation variety, Nov 2008.
- Ideal triangulations and components of the Character variety, Nov 2007.
On 23rd February 2008 I gave a talk to the University of Texas Mathematics Department's Saturday Morning Math Group (for an audience of around 200 high school students from nearby schools in the area), you can see a video of it here (scroll down to my talk).
Art Exhibitions
- In the Realm of Forms, Pearl Conard Art Gallery, Ohio State University, Mansfield Campus, OH: Conformal Chmutov, Seifert surface for (2,2) torus link, Seifert surface for (2,2) torus link with fibers, Seifert surface for (3,3) torus link, Seifert surface for (3,3) torus link with fibers (all with Saul Schleimer), November 9 -- December 8, 2015.
- MathThematic: a fine art exhibition, Esther Klein Gallery, Philadelphia, PA: Quaternary Tree Mobile (Level 5), (with Marco Mahler), October 7 -- November 20, 2015.
- Bridges conference 2015: Hypernom (with Vi Hart, Andrea Hawksley and Marc ten Bosch), Monkey See, Monkey Do (with Vi Hart, Andrea Hawksley, Will Segerman and Marc ten Bosch), Hyperbolic Catacombs and {∞,∞,∞} (with Roice Nelson), Torus knots and Seifert surfaces (with Saul Schleimer, in the short movie festival).
- Joint Mathematics Meetings 2015: Hilbert Sphere (with David Bachman and Robert Fathauer), Hyperbolic Catacombs and Regular {4,6,4} H^{3} Honeycomb (with Roice Nelson), and More fun than a hypercube of monkeys (with Will Segerman).
- Bridges conference 2014: Developing Fractal Curves, More fun than a hypercube of monkeys (with Will Segerman), "Buckyball" Buckyball (with Rosa Zwier).
- Simons Center for Geometry and Physics, Illustrating Geometry Art Exhibition, solo show with Saul Schleimer, 19 June - 1 August 2014. Catalog (26 pieces), Posters, Walkthrough video.
- Joint Mathematics Meetings 2014: Triple gear (with Saul Schleimer).
- First Annual Museum of Mathematics Gala, October 2013, 49 colour 3D prints designed as table centerpieces.
- Bridges conference 2013: Triple gear (with Saul Schleimer; won the "Most Innovative" People's Choice Award, one of four awards given), Seifert surfaces for (3,3) and (4,4) torus links (with Saul Schleimer), "Bunny" Bunny (with Craig S. Kaplan).
- Edinburgh International Science Festival, City Art Centre Exhibition 2013: ten sculptures.
- Joint Mathematics Meetings 2013: Seifert surfaces for torus knots and links (with Saul Schleimer), Developing Fractal Curves.
- Bridges conference 2012: Dual Half 120- and 600-Cells (with Saul Schleimer; won the "Most Effective Use of Mathematics" People's Choice Award, one of four awards given.)
- Joint Mathematics Meetings 2012: Round Möbius strip, Round Klein bottle (with Saul Schleimer).
- Bridges conference 2011: Space filling graph 1, Octahedron fractal graph, Cuboctahedral fractal graph.
- Bridges conference 2010: Sphere autologlyph, Torus autologlyph.
Press
14 Dec 2015: Gary Antonick featured a 3D animation of Saul Schleimer's and my Triple gear at the end of a New York Times Numberplay post.
15 Feb 2015: I gave a talk on visualising four-dimensional objects at the annual meeting of the American Association for the Advancement of Science. Science, New Scientist and NBC News wrote blog posts about it.
30 Oct 2014: Alex Bellos wrote a blog post for The Guardian entitled "Pumpkin geometry: stunning shadow sculptures that illuminate an ancient mathematical technique", on stereographic projection sculptures by Saul Schleimer and me.
19 May 2014: Evelyn Lamb wrote a blog post for Scientific American on "More fun than a hypercube of monkeys", a sculpture by my brother Will and me, inspired by a question of Vi Hart.
15 March 2013: Megan Gambino wrote a blog post for Smithsonian magazine on my 3D printed sculpture.
31 October 2012: Evelyn Lamb wrote a blog post for Scientific American on the "30-cell puzzle", a 3D printed puzzle by Saul Schleimer and me based on the 120-cell, one of the regular 4-dimensional polytopes.
23 August 2012: My sculpture "Dual Half 120- and 600-Cells" (joint work with Saul Schleimer) won the "Best Use of Mathematics" prize (one of four prizes awarded) at the Bridges conference 2012. It was featured in a slide show on the Scientific American website.
January 2012: I was interviewed for an article in the "Voice", a publication put out by the University of Melbourne, on "The language and art of maths". Here is the article. The online version of the article is missing the image (shown here) that went with the article. Alternatively, here is a pdf of the whole publication, which includes the article (on page 4) together with the photograph.
6 December 2011: I was interviewed by BBC Radio 5 about mathematical art and 3D printing. Here is the blogpost for the podcast. Here is the direct link to the mp3.
February 2008: I was interviewed on She Blinded Me With Science!, a show on the student radio station KVRX, talking about topology and juggling. You can listen to the interview here.
Links
My Hilbert curve 3d print is available at vismath.eu, a German mathematics website and shop (English language version).
Go here for my personal website. Particularly math(s) related things: 3D printed sculpture, Autologlyphs, Escher's Printgallery at Stanford, Book Covers and Posters, T-shirt designs.
For keeping track of your and your friends' (lack of) mathematical progress: Ways to Go Wrong Tally Sheet.
My old University of Melbourne math website is here. My old University of Texas math website is here. My old Stanford math website is here.
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