Date: | March 28, 2017 |

Time: | 10:00AM - 11:00AM |

Location: | TBA |

Speaker: | Florent Baudier, Texas A&M University |

Title: | Bi-Lipschitz embeddability of finitely branching diamonds (after M. I. Ostrovskii and B. Randrianantoanina) |

Abstract: | Johnson and Schechtman showed that the sequence of binary diamonds admits an equi-bi-Lipschitz embedding into any non super-reflexive Banach space. The analogue question for $k$-branching diamond graphs (k larger than 3 but finite) was solved recently by Ostrovskii and Randrianantoanina. They showed that despite the factorization approach of Johnson and Schechtman has some limitation one can still construct an equi-bi-Lipschitz embedding of the sequence the $k$-branching diamond graphs into any non super-reflexive Banach space, using a different technique. We will talk briefly about the factorization approach and its limitation and spend most of the talk explaining the key points of the rather technical embedding construction. |

Date: | March 28, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOCKER 117 |

Speaker: | Constantine Dafermos, Brown University |

Title: | Hyperbolic Conservation Laws: History, State of the Art and Future Challenges - Part II |

Date: | March 29, 2017 |

Time: | 12:00PM - 1:00PM |

Location: | Bloc 628 |

Speaker: | Isaac Harris, TAMU |

Title: | A Direct Method for reconstructing inclusions from Electrostatic Data |

Abstract: | In this talk, we will discuss the use of a Sampling Method to reconstruct impenetrable inclusions from Electrostatic Cauchy data. Sampling Methods allow one to recover unknown obstacles with little to no a prior information. These methods are computationally simple to implement and analytically rigorous. We consider the case of an Impedance (Robin) inclusion where we show that the Dirichlet-to-Neumann mapping can be used to reconstruct such impenetrable sub-regions. We also propose a non-iterative method based on Boundary Integral Equations to reconstruct the impedance parameter from the knowledge of multiple Cauchy pairs. Some numerical reconstructions will be presented in two dimensions. We will also briefly discuss the extension to other Inverse Boundary Value Problems. |

Date: | March 29, 2017 |

Time: | 1:00PM - 2:00PM |

Location: | BLOC 624 |

Speaker: | Mehrzad Monzavi, Texas A&M University |

Title: | Gottschalk's surjunctivity conjecture for Sofic groups II |

Date: | March 30, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOCKER 117 |

Speaker: | Constantine Dafermos, Brown University |

Title: | Hyperbolic Conservation Laws: History, State of the Art and Future Challenges - Part III |

Date: | March 31, 2017 |

Time: | 3:00PM - 3:50PM |

Location: | BLOC 628 |

Speaker: | Elizabeth Gross , San Jose State University |

Title: | Combinatorial and algebraic problems in systems biology |

Abstract: | Systems biology focuses on modeling complex biological systems, such as metabolic and cell signaling networks. These biological networks are modeled with polynomial dynamical systems that can be described with directed graphs. Analyzing these systems at steady-state results in polynomial ideals with significant combinatorial structure. Using the Wnt shuttle model as an example, we will discuss some of the combinatorial and algebraic techniques available for parameter estimation and model selection. We will then look at the algebraic problems that arise when constructing new network models from smaller models through gluing operations on the corresponding directed graphs. This talk draws on joint work with Heather Harrington, Zvi Rosen, and Bernd Sturmfels, as well as joint work with Heather Harrington, Nicolette Meshkat, and Anne Shiu. |

Date: | March 31, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 220 |

Speaker: | Andrew Swift, Texas A&M Univeristy |

Title: | Coarse embeddings into superstable spaces |

Abstract: | If a Banach space coarsely embeds into a superstable Banach space, then it must contain a basic sequence with an ℓp spreading model for some p∈[1,∞). This is a coarse analogue to a result of Y. Raynaud, which says that if a Banach space uniformly embeds into a superstable Banach space, then it must contain a subspace isomorphic to ℓp for some p∈[1,∞). The result obtained implies that not every reflexive Banach space is coarsely embeddable into a superstable Banach space. A sketch of the proof will be given, and comparisons to Raynaud's proof in the uniform case will be made. This is joint work with B. M. Braga. |

Date: | March 31, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOC 628 |

Speaker: | Ata Firat Pir, TAMU |

Title: | Irrational Toric Varieties |

Abstract: | Classical toric varieties come in two flavors: Normal toric varieties are given by rational fans in R^n. A (not necessarily normal) affine toric variety is given by finite subset A of Z^n. Toric varieties are well understood and they can be approached in a combinatorial way, making it possible to compute examples of abstract concepts. Applications of mathematics have long studied the positive real part of a toric variety as the main object, where the points in A may be arbitrary points in R^n. In 1963, Birch showed the such an irrational toric variety is homeomorphic to the convex hull of the set A. Recent work showing that all Hausdorff limits of translates of irrational toric varieties are toric degenerations suggested the need for a theory of irrational toric varieties associated to arbitrary fans in R^n. These are R^n_>-equivariant cell complexes dual to the fan. Among the pleasing parallels with the classical theory is that the space of Hausdorff limits of the irrational projective toric variety of a finite set A in R^n is homeomorphic to the secondary polytope of A. This talk will sketch this story of irrational toric varieties. It represents work in progress with Sottile. |

Date: | April 5, 2017 |

Time: | 1:45PM - 2:45PM |

Location: | BLOC 220 |

Speaker: | Frank Thorne, University of South Carolina |

Title: | TBA |

Date: | April 5, 2017 |

Time: | 6:00PM - 7:00PM |

Location: | BLOC 220 |

Speaker: | Dr. Prabir Daripa, Texas A&M University, Department of Mathematics |

Title: | TBA |

Date: | April 7, 2017 |

Time: | 11:00AM - 12:00PM |

Location: | BLOC 220 |

Speaker: | Bingyuan Liu, UC Riverside |

Title: | The Diederich Fornaess index |

Abstract: | In this talk, we discuss the Diederich–Fornæss index in several complex variables. A domain Ω ⊂ C^n is said to be pseudoconvex if − log(−δ(z)) is plurisubharmonic in Ω, where δ is a signed distance function of Ω. The Diederich–Fornæss index has been introduced since 1977 as a index to re- fine the notion of pseudoconvexity. We will discuss this index for smoothly bounded domains in Ω ⊂ C^n after a brief review of pseudoconvexity. |

Date: | April 7, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 220 |

Speaker: | Gilles Lancien, Université de Franche-Comté |

Title: | tba |

Abstract: | tba |

Date: | April 7, 2017 |

Time: | 3:00PM - 3:50PM |

Location: | BLOC 628 |

Title: | Algebra and Combinatorics Course Discussion |

Date: | April 7, 2017 |

Time: | 4:00PM - 5:00PM |

Speaker: | Alperen Ergur, NC State University |

Title: | TBA |

Abstract: | TBA |

Date: | April 10, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 628 |

Speaker: | Conall Kelly, UWI Mona |

Date: | April 10, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 220 |

Speaker: | Fulvio Gesmundo, TAMU |

Title: | TBA |

Abstract: | TBA |

Date: | April 10, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOC 220 |

Speaker: | Alex Hao, CGG |

Title: | TBA |

Date: | April 11, 2017 |

Time: | 10:00AM - 11:00AM |

Location: | TBA |

Speaker: | Florent Baudier, Texas A&M University |

Title: | Uniform homeomorphisms of Banach spaces and asymptotic structure (after N. J. Kalton) part I |

Abstract: | TBA |

Date: | April 14, 2017 |

Time: | 1:50PM - 2:50PM |

Location: | BLOC 628 |

Speaker: | Justin Wilson, Caltech |

Title: | TBA |

Date: | April 14, 2017 |

Time: | 3:00PM - 3:50PM |

Location: | BLOC 628 |

Speaker: | Mitchell Phillipson, St. Edward's University |

Title: | TBA |

Date: | April 14, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 220 |

Speaker: | Boaz Slomka, University of Michigan |

Title: | tba |

Abstract: | tba |

Date: | April 14, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOC 628 |

Speaker: | Kaitlyn Phillipson, St. Edwards Univ. |

Title: | TBA |

Date: | April 17, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 628 |

Speaker: | Junchi Li, Princeton |

Title: | TBA |

Abstract: | TBA |

Date: | April 17, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOC 628 |

Speaker: | Frank Sottile, TAMU |

Title: | TBA |

Abstract: | TBA |

Date: | April 18, 2017 |

Time: | 10:00AM - 11:00AM |

Location: | TBA |

Speaker: | Gilles Lancien, Université Bourgogne Franche-Comté |

Title: | Uniform homeomorphisms of Banach spaces and asymptotic structure (after N. J. Kalton) part II |

Date: | April 18, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | TBA |

Speaker: | Kristin Lauter, Microsoft Research |

Title: | Maxson Lecture I |

Date: | April 19, 2017 |

Time: | 1:45PM - 2:45PM |

Location: | BLOC 220 |

Speaker: | Nathan Green, Texas A&M University |

Title: | TBA |

Date: | April 19, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 628 |

Speaker: | Maciej Paszynski, Department of Computer Science, AGH University, Krakow, Poland |

Title: | Fast isogeometric finite element method solver for melanoma tumor growth simulations |

Abstract: | In this talk, we present an application of the fast algorithm for isogeometric L2 projections for simulations of the tumor growth. We introduce first the system of PDEs describing the model of the melanoma growth, including tumor cell density, flux, pressure, extracellular and degraded extracellular matrices. We also introduce a discrete L-systems model of the vasculature, that provides an oxygen source to the system. The system is solved using explicit scheme and fast isogeometric L2 projections, utilizing the alternating directions solver. Every ten-time steps of the simulation, we couple our continuous model with the discrete vasculature model. We also discuss shared-memory based parallelization of the isogeometric L2 projections solver, using the GALOIS framework [1]. We conclude the presentation with the two-dimensional numerical results from [2], and preliminary parallel three-dimensional results. [1] Marcin Los, Maciej Wozniak, Maciej Paszynski, Andrew Lenharth, Muhamm Amber Hassaan, Keshav Pingali, IGA-ADS : Isogeometric Analysis FEM using ADS solver, Computers & Physics Communications (2017) in press.DOI:10.1016/j.cpc.2017.02.023 [2] Marcin Los, Maciej Paszynski, Adrian Klusek, Witold Dzwinel, Application of fast isogeometric L2 projection solver for tumor growth simulations, Computer Methods in Applied Mechanics and Engineering, 316 (2017) 1257-1269 |

Date: | April 19, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | TBA |

Speaker: | Kristin Lauter, Microsoft Research |

Title: | Maxson Lecture II |

Date: | April 21, 2017 |

Time: | 3:00PM - 3:50PM |

Speaker: | TAGS, Rice University |

Title: | Texas Algebraic Geometry Symposium |

Date: | April 21, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 220 |

Speaker: | Florence Lancien, Université de Franche-Comté |

Title: | tba |

Abstract: | tba |

Date: | April 21, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOC 220 |

Speaker: | Michael Brannan, TAMU |

Title: | TBA |

Abstract: | TBA |

Date: | April 24, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 628 |

Speaker: | Alexandros Eskenazis, Princeton |

Title: | TBA |

Abstract: | TBA |

Date: | April 24, 2017 |

Time: | 3:00PM - 4:00PM |

Location: | BLOC 628 |

Speaker: | Corey Harris, Florida State |

Title: | TBA |

Date: | April 24, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | BLOC 220 |

Speaker: | Kim Laine, Microsoft |

Title: | TBA |

Date: | April 26, 2017 |

Time: | 6:00PM - 7:00PM |

Location: | BLOC 220 |

Speaker: | Pat Laycock, Aon Hewitt |

Title: | Math Related Careers at Aon Hewitt: Pension Administration Consulting |

Abstract: | Aon Hewitt’s Retirement and Financial Management practice would like to present to you our career opportunities in the Pension Administration Consulting field that focus heavily on math skills. We are always looking for candidates with strong math and analytical skills who are also able to communicate well with clients and their participants as well as works successfully in a team environment. Our Pension Administration Specialist role is responsible for such tasks as pension system design and testing, data analysis/scrubbing, pension calculations, payment instructions and reconciliations, participant interaction and legislative and design consulting. We are looking for candidates for our 2017 summer internships as well as full-time positions on our campus located in The Woodlands, TX (just north of Houston). |

Date: | April 27, 2017 |

Time: | 4:00PM - 5:00PM |

Location: | TBA |

Speaker: | William Green, Rose-Hulman |

Title: | Dispersive estimates for the Dirac equation |

Abstract: | In this talk we discuss dispersive decay estimates for the Dirac equation in dimensions 2 and 3. The Dirac equation is a relativistic generalization of the Schrödinger equation. We will first review dispersive estimates for the Schrödinger equation, then present extensions to the Dirac equation. As in the case of the Schrödinger equation, the decay rate is affected by threshold resonances and/or eigenvalues. |