The Department of Mathematical Sciences enjoys an active Colloquium series. There are also departmental research seminars in Analysis and Discrete Mathematics. All our events are open to students and the public, and are free to attend unless otherwise indicated.
Spring 2015
Colloquium
 Maya Stoyanova, Sofia University, Universal Lower Bounds on Energy  Computational Aspects, Wednesday, March 18, noon to 1 in KT 216.

Peter G. Boyvalenkov, Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Energy Bounds for Codes and Designs in H(n,q). March 4.
 Peter Dragnev, IPFW, Universal lower bounds for potential energy of spherical codes, Feb. 4.
 Abstract: Minimal energy configurations (codes), maximal codes, and spherical designs have wide ranging applications in various fields of science, such as crystallography, nanotechnology, material science, information theory, wireless communications, etc. We derive universal lower bounds for the potential energy of spherical codes, that are optimal in the framework of the standard linear programming approach and provide a characterization of when improvements are possible. Our bounds are universal in the sense of Cohn and Kumar; i.e., they apply to any absolutely monotone potential. Joint work with Peter Boyvalenkov, IMISofia; Doug Hardin and Ed Saff, Vanderbilt University; and M. Stoyanova, Sofia University.
 Photo page
Analysis Seminar
 Yifei Pan, Unique continuation for higherorder CauchyRiemann operators II. Fri., March 6, noon to 1:00 in KT 218.
 Adam Coffman, Counterexamples in one complex variable, II.
 Yifei Pan, Unique continuation for higherorder CauchyRiemann operators.
 Yifei Pan, Unique continuation and three circles.
 Adam Coffman, Counterexamples in one complex variable, I.
Fall 2014
MIGHTY Graph Theory Conference
Colloquium
 Robin Wilson, Open University, England, Euler: 300 Years On. Oct. 1. Photo Page. Joint with PI Math Club
 Peter Hamburger, Western Kentucky University, and IPFW Emeritus, Social and Socioeconomic Sciences and Dimension of Posets. Oct. 2. Photo page.
 A Celebration of the Mathematical Mind event for the Martin Gardner Centennial

 Soap Bubbles and Geometry, by Professor Coffman
 Short talks on recreational mathematics by Professor Berry, Andy Rich, Manchester University, and Mel Royer, Indiana Wesleyan University.
 Photo Page
 Robin Wilson, Open University, England, Mathematics: A Philatelic History
 In this talk I cover the entire history of mathematics in just over an hour! To do so, I shall illustrate it in an unusual way – with over 300 postage stamps featuring mathematics and mathematicians – some very bizarre!
 Oct. 3. Followed by tea and cookies reception.
 Photo page
Summer 2014
Workshop
Colloquium
 David Benko, University of South Alabama, Comparing Tennis Tournaments
 July 29  Photo page
 Abstract: The four major tennis tournaments (Grand Slams) are the Australian Open, the US Open, the Roland Garros, and Wimbledon. They are played on different surfaces and under different weather conditions. Which one is the best tournament? The answer seems subjective but we will find a mathematical method to answer objectively. Our method is applicable to other sports, too.
 Peter Boyvalenkov, Bulgarian Academy of Sciences, Polynomial Techniques for Investigation of Spherical Designs, May 22.
Spring 2014
Conference and Student Competition
Colloquium
 Dusty Grundmeier, University of Michigan, Hilbert Functions and Positivity Conditions in Complex Analysis. April 16. Photo Page
 Keng Deng, University of Louisiana at Lafayette, Blowup for the Heat Equation with a General Memory Boundary Condition. April 23.
PI Math Club
 PI Math Club/Pi Mu Epsilon student talks: At this annual event, IPFW students talk about their research or independent projects. Talks are April 16, about 15 minutes long. The talks will be judged for cash prizes sponsored by Pi Mu Epsilon.
 Luke Bertsch, Fantasy Baseball Simulation
 Vreneli Brenneman, Geometry Meets Origami: Halving the Square
 Charles Burd, Even Statisticians Love Geometry
 Alex Liu, Everyone Deserves A Second Chance
 Magali de Macedo, Using Finite Series to Evaluate the LifeCycle of Chemical Reactors
 An Analysis of PassthePigs, Prof. Michael Sonksen, University of New Mexico, and IPFW alumnus. April 10
Pi Mu Epsilon
 Prof. Lipman, What's your birthday? April 27.
Fall 2013
Colloquium

SuiChung Ng, Temple University, Holomorphic isometry among bounded symmetric domains and its motivations, Nov. 12.
Analysis MiniSymposium
 Mystery Speaker, What's so special about Dec. 5, 2013?
 Prof. Coffman, Geometry in Perspective, Nov. 13.
Analysis Seminar
 Adam Coffman, Notes on Rosay's Notes on normal forms for almost complex structures. Sept. 26.
Spring 2013
Colloquium
 Joint with PI Math Club: Edray Goins, Purdue W. L., on An Introduction to Dessins d'Enfants: The Intersection of Graph Theory, Group Theory, and Differential Geometry. March 6.
 John Erik Fornæss, University of Michigan Emeritus, Exposing Points. Jan. 23. Photo Page
 Peter Dragnev, From Electrons to Orifices to Fullerenes: The Unfolding Story of Energy Optimization. Feb. 20. Photo page
 Prof. Dragnev, Characterizing stationary logarithmic points on the sphere, Jan. 30.
 PI Math Club/Pi Mu Epsilon student talks: At this annual event, IPFW students talk about their research or independent projects. Talks start at noon, April 24, and will continue until 1:30 (or sooner). The talks are judged for cash prizes. Photo page
 Graph Theory and Crystal Physics  Harry Francies
 Counting Euler Circuits  Cullen Hauser
 Golden Discoveries  Vreneli Brenneman
 Generalized Thompson Problem for 5 Points  Altun Shukurlu
 Creative Applications of Design of Experiments  Magali de Macedo
 Why Such a Big Deal About a Sample of 30 or More?  Peter Saya
 Prof. Coroian, The Transit of Venus and why it was one of the most important events in science history. Sunday, May 28. Photo page
Fall 2012
Colloquium
 Peter Hamburger, Western Kentucky University, and IPFW Professor Emeritus, An Alternative Proof of Bézout's Theorem. Nov. 20. Photo page
Analysis MiniSymposium
 Second annual symposium: November 9.
 9:00 Norm Levenberg, Indiana University Bloomington, Projective hulls and characterizations of meromorphic functions
 10:00 Sergiy Borodachov, Towson University, Asymptotics for the discrete minimum Riesz energy problem
 11:00 Yu Yan, Huntington University, A Hopf lemma for higher order differential inequalities and its applications
 1:30 Yuan Zhang, IPFW, Supnorm estimates for dbar on infinite type convex domains in C^{2}
 3:30 Yifei Pan, IPFW, Finding flat solutions of the CauchyRiemann equation with flat data
 Printable Poster:
 Schedule and Abstracts:
 Photo page
 Sponsored by IPFW Office of Research, Engagement, and Sponsored Programs
Analysis Seminar
 Yifei Pan, A complex integral surface on a manifold: The definition and local existence theorem.
 Yifei Pan, Unique continuation of CauchyRiemann operator with L^{2} potential.
 Adam Coffman, Counterexamples to strong unique continuation for a Beltrami system in C^{2}, II.
 Yuan Zhang, CR singular images.
 Adam Coffman, Parabolic CR singularities.
 Prof. Beineke, Through the lurking graphs. Nov. 14.
 Prof. Chauhan, Statistics lasts because it puts quality first. Oct. 17.
Spring 2012
Colloquium
 Maxim Yattselev, University of Oregon, Spurious poles in Padé approximation of algebraic functions, Feb. 27.
 Yuan Zhang, University of California San Diego, Global extension and rigidity for local holomorphic isometric embeddings, Feb. 28.
 Peter Hamburger, Western Kentucky University, Much Ado about Real Numbers, April 4. (joint with PI Math Club)
 Yifei Pan, Solvability of Partial Differential Equations. Feb. 24. Photo page
 Student talks event: April 11.
 Calculus for Climatologists, Guchen (Alex) Liu
 The Easiest Solution Isn't Always the Best Solution, Even in Math, Aldane Hoilett
 Billy Rhoades, Indiana University Bloomington Emeritus, Euler Was Right. Jan. 25.
 Yvonne Zubovic, Mathematics, Magic, and the Mysteries of Life. April 15, 3  5 p.m.
Analysis Seminar
 Dave Redett, An introduction to weakly stationary processes. March 12.
 Abstract: I will begin by defining what it means for a stochastic process to be weakly stationary. We will then consider some examples. After identifying the spectral measure for a weakly stationary process, we will see how properties of this measure are reflected in the structure of the weakly stationary process.
Fall 2011
COAS Distinguished Lecturer
Analysis MiniSymposium
Colloquium
 Yuan Zhang, UCSD, ChernMoserWeyl tensor theory and its applications to the Hopf Lemma for CR maps, Nov. 11.
 In this talk, we give a monotonicity formula for the ChernMoserWeyl curvature tensor for CR embeddings between germs of Levi nondegenerate hypersurfaces of the same signature. The criterion allows us to construct many algebraic Levi nondegenerate hypersurfaces which are nonembeddable into hyperquadrics of the same signature. We also show that any CR map from a germ of a Levi nondegenerate hypersurface M in C^{n} into a hyperquadric of the same signature in C^{n+1}, if does not send an open set of C^{n} into the hyperquadric, is always CR transversal (equivalently, a CR embedding) at nonumbilical points. This is joint work with X. Huang.
 J. Millspaw, IPFW Physics, Noisy Color Math, Oct. 19.
Discrete Math Seminar
 Drew Lipman, University of Waterloo alumnus, An introduction to primal graphs, Nov. 14.
 M. Lipman, M. Walsh, and L. Hicks, Proper graph coloring. Sept. 26.
Analysis Seminar
 I. Kossovskiy, University of Western Ontario, Mappings of 2nondegenerate hypersurfaces in dimension three, Nov. 11.
 Let (M,p) and (M',p') be two real hypersurfaces with distinguished points in complex affine nspace and let H(M,p;M',p') be the space of local biholomorphic mappings of the ambient space preserving the hypersurfaces and the distinguished points. How "rich" can the space H(M,p;M',p') be? Poincaré (for n=2) and later Chern and Moser (for arbitrary n) in their famous papers gave the answer to this question for Levi nondegenerate hypersurfaces. Their results generated a big stream of further papers on CRgeometry and led to remarkable theorems in complex analysis. Using a new approach, we avoid the difficulties which occur in the Levidegenerate case and reproduce the PoincaréChernMoser theory for the case of 2nondegenerate hypersurfaces in complex 3space. This is joint work with Valery Beloshapka.
 Y. Pan, On solvability of nonlinear partial differential systems of any order in dimension two. Sept. 27.
 In this talk, we present a general existence result (local and global) for a nonlinear partial differential system of any order in dimension two. In particular it implies the local existence of Jholomorphic curves on a almost complex manifold, due to Nijenhuis and Woolf, and also implies the existence of harmonic maps from the unit disk to any Riemannian manifold with prescribed tangent vector, which could be new. As a consequence of the method, we prove that any nonlinear partial differential system with a power m of the Laplace operator as principal part can be always solvable locally for any jet of order 2m1 at the origin. At the same time, global solutions can be obtained, provided the system vanishes to first order at the origin. These results are almost best possible due to the classical theory of Ahlfors and Osserman.
Summer 2011
Colloquium
 David Benko, University of South Alabama, On a Remarkable Infinite Series. May 26.
 The Riemann hypothesis concerns the zeros of the Riemann zeta function. In the talk we study another infinite series which we construct by modifying the Riemann zeta function. This function has a resemblance to the Riemann zeta function in respect to the location of its zeros: its zeros are located on a line. So we call this property the "mini Riemann hypothesis". The function behaves much more simply than the zeta function, so we can think of it as a starting point to get familiar with the zeta function itself.
Spring 2011
Conference
Analysis Seminar
 Adam Coffman, Counterexamples to strong unique continuation for a Beltrami system in C^{2}.
Pi Math Club
 Lunchtime presentation by Prof. Coroian, Brahe, Kepler, Newton and the Laws of Planetary Motion.
 Student Talks event:
 Heip Nguyen, Roller Derby
 Melissa Guse, Way Harder Than Fly Fishing: Comparing the means of two populations
 Brad Moss, A New Approach for Comparing the Means of Two Populations
 Garret Marshall, Generalized Estimating Equations and QuasiLeast Squares
 G. Venema, Calvin College, Dimension Theory for Undergraduates.
 D. Maloney, IPFW Physics, Deciding how to attack a problem.
 Alex James, IPFW alumnus, Educating a different kind of mathematician. Installation ceremony Sunday, May 1, 3pm.
Archive of Past Seminars, Colloquia, and Events (20092010)
Archive of Past Seminars, Colloquia, and Events (19972008)
Some other past events: