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PRODID:-//Department of Mathematics - ECPv4.9.9//NONSGML v1.0//EN
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METHOD:PUBLISH
X-WR-CALNAME:Department of Mathematics
X-ORIGINAL-URL:https://math.sciences.ncsu.edu
X-WR-CALDESC:Events for Department of Mathematics
BEGIN:VTIMEZONE
TZID:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20190310T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20191103T060000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191021T150000
DTEND;TZID=America/New_York:20191021T160000
DTSTAMP:20191019T162027
CREATED:20190908T003634Z
LAST-MODIFIED:20191007T182809Z
UID:15359-1571670000-1571673600@math.sciences.ncsu.edu
SUMMARY:Duff Baker-Jarvis\, Wake Forest University\, QSym and the Shuffle Compatibility of Permutation Statistics
DESCRIPTION:The fundamental basis of the Hopf algebra of quasisymmetric functions\, QSym\, can be thought of in terms of shuffling permutations. We can think of QSym as having a basis indexed by equivalence classes of permutations\, where we identify permutations with the same descent set. This descent set\, Des\, is a simple example of a permutation statistic that exhibits a property called being shuffle compatible. We will show that permutation statistics that are shuffle compatible give rise to “shuffle algebras” that are quotients of QSym and then discuss some bijective proofs that certain statistics are also shuffle compatible. \n
URL:https://math.sciences.ncsu.edu/event/duff-baker-jarvis-wake-forest-university/
LOCATION:SAS 4201
CATEGORIES:Algebra and Combinatorics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191022T120000
DTEND;TZID=America/New_York:20191022T130000
DTSTAMP:20191019T162027
CREATED:20190806T203341Z
LAST-MODIFIED:20190816T121001Z
UID:14945-1571745600-1571749200@math.sciences.ncsu.edu
SUMMARY:Diversity and Inclusion Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/diversity-and-inclusion-brown-bag-lunch-12/
LOCATION:SAS 4201
CATEGORIES:Diversity and Inclusion in Mathematical and Statistical Sciences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191022T133000
DTEND;TZID=America/New_York:20191022T143000
DTSTAMP:20191019T162027
CREATED:20191007T125446Z
LAST-MODIFIED:20191007T125446Z
UID:15643-1571751000-1571754600@math.sciences.ncsu.edu
SUMMARY:Ákos Nagy\, Duke University\, Complex Monopoles
DESCRIPTION:Self-duality equations in gauge theory can be complexified in many inequivalent ways\, but there are two obvious options: One can extend Hodge duality in either a complex linear fashion\, or in a conjugate linear one. In general\, the two cases result in two very different equations. The first case was first studied by Haydys\, while the second is due to Kapustin and Witten. In this talk\, I will focus on the complexification of the 3-dimensional BPS monopole equations. We call solutions to these equations Haydys and Kapustin-Witten monopoles\, respectively. We find a stark contrast between them: On one hand\, we construct an open neighborhood of the BPS moduli space within the Haydys moduli space\, and show that this neighborhood is a smooth\, hyperkahler manifold of dimension twice that of the Bogomolny moduli space. On the other hand\, we prove that a (finite energy) Kapustin-Witten monopole is necessarily a BPS monopole when the structure group is SU(2). In fact\, this latter result generalizes to 4-dimensions as well. Joint work with Goncalo Oliveira\, UFF\, Brazil. \n
URL:https://math.sciences.ncsu.edu/event/akos-nagy-duke-university-complex-monopoles/
LOCATION:SAS 4201
CATEGORIES:Geometry and Topology Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191022T150000
DTEND;TZID=America/New_York:20191022T160000
DTSTAMP:20191019T162027
CREATED:20191003T164646Z
LAST-MODIFIED:20191003T165744Z
UID:15637-1571756400-1571760000@math.sciences.ncsu.edu
SUMMARY:Shahar Kovalsky\, Duke University\, Planar surface embeddings and non-convex harmonic maps
DESCRIPTION:Mappings between domains are among the most basic and versatile tools used in the computational analysis and manipulation of shapes. Their applications range from animation in computer graphics to analysis of anatomical variation and anomaly detection in medicine and biology. \nMy talk will start with a brief overview of discrete computational shape mapping\, surface parameterization (flattening)\, and their applications. I will then discuss invertibility\, an often desirable property of mappings\, and present an optimization approach for efficiently computing invertible surface maps. With large-scale problems in mind\, we will focus on Tutte’s embedding theorem and its continuous counterpart\, the Rado-Kneser-Choquet theorem: they assert that planar harmonic maps (solutions of Laplace’s equation) with convex boundary conditions are invertible. Finally\, we will see that convexity\, a key ingredient of both theorems\, can be replaced with a novel\, less restrictive and geometrically intuitive condition\, thus extending these theorems to the case of harmonic maps onto non-convex domains. \n
URL:https://math.sciences.ncsu.edu/event/arvind-saibaba-nc-state-planar-surface-embeddings-and-non-convex-harmonic-maps/
LOCATION:SAS 4201
CATEGORIES:Numerical Analysis Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191023T121500
DTEND;TZID=America/New_York:20191023T130000
DTSTAMP:20191019T162027
CREATED:20190830T012326Z
LAST-MODIFIED:20190830T012326Z
UID:15627-1571832900-1571835600@math.sciences.ncsu.edu
SUMMARY:AWM Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/awm-brown-bag-lunch-2019-10-02/2019-10-23/
LOCATION:SAS 3281
CATEGORIES:Association for Women in Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191023T150000
DTEND;TZID=America/New_York:20191023T160000
DTSTAMP:20191019T162027
CREATED:20190906T153859Z
LAST-MODIFIED:20190906T153859Z
UID:15350-1571842800-1571846400@math.sciences.ncsu.edu
SUMMARY:Piermarco Cannarsa\, University of Rome “Tor Vergata”\, Bilinear control for evolution equations of parabolic type
DESCRIPTION:Recently\, in a series of joint papers with F. Alabau-Boussouira and C. Urbani\, I have studied the response of an evolution equation on a Hilbert space to the action of a bilinear control. As is well-known\, a bilinear control is a scalar function of time multiplying one of the coefficient of the equation (usually\, a lower order term). Therefore\, this is a nonlinear control problem\, even if the equation is linear in the state variable. For such a problem\, exact controllability is out of question\, due to a well-known negative result by Ball\, Marsden\, and Slemrod back in the 80’s.In this talk\, equations of parabolic type will be considered\, meaning that the infinitesimal generator – of the strongly continuous semigroup which drives the system – is assumed to be a self-adjoint accretive operator. It will be explained how\, under some conditions relating the spectrum of the generator to the control coefficient\, one can locally stabilise the system to the solution associated with the ground state at a double exponential speed\, or even attain such a ground-state solution in finite time. Applications to concrete parabolic problems will also be provided. \n
URL:https://math.sciences.ncsu.edu/event/piermarco-cannarsa-university-of-rome-tor-vergata-bilinear-control-for-evolution-equations-of-parabolic-type/
LOCATION:SAS 4201
CATEGORIES:Differential Equations,Nonlinear Analysis Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191024T153000
DTEND;TZID=America/New_York:20191024T160000
DTSTAMP:20191019T162027
CREATED:20190816T182402Z
LAST-MODIFIED:20190925T164326Z
UID:15047-1571931000-1571932800@math.sciences.ncsu.edu
SUMMARY:Tea and Cookies
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/tea-and-cookies-30/
LOCATION:SAS 4104
CATEGORIES:Departmental Event
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191024T160000
DTEND;TZID=America/New_York:20191024T170000
DTSTAMP:20191019T162027
CREATED:20190911T141458Z
LAST-MODIFIED:20191016T155640Z
UID:15398-1571932800-1571936400@math.sciences.ncsu.edu
SUMMARY:Piermarco Cannarsa\, University of Rome Tor Vergata\, Italy\, Propagation of singularities for solutions to Hamilton-Jacobi equations
DESCRIPTION:The study of the structural properties of the set of points at which the viscosity solution of a first order Hamilton–Jacobi equation fails to be differentiable—in short\, the singular set—started with the paper On the Singularities of Viscosity Solutions to Hamilton–Jacobi–Bellman Equations\, Indiana Univ. Math. J. 36 (1987)\, 501–524 by Mete Soner and myself. These thirty years have registered enormous progress in the comprehension of the way how singularities propagate: We can now provide a fine topological analysis of the singular set\, describe singular dynamics by generalized characteristics\, and even study the long time behavior of singular curves. In my talk\, I will revisit the milestones of this theory and discuss possible developments and open problems. \nPiermarco Cannarsa graduated in Mathematics from the Scuola Normale Superiore and University of Pisa in 1979. Since 1990\, he is a Professor of Mathematical Analysis at the University of Rome Tor Vergata\, where he has been the advisor for 14 Ph.D. students. Cannarsa’s scientific interests include partial differential equations\, control theory\, and nonsmooth analysis. His current research is concerned with control of partial differential equations\, as well as regularity of viscosity solutions to Hamilton–Jacobi–Bellman equations and mean field games. He authored about 130 papers in international journals and 2 books including Semiconcave Functions\, Hamilton–Jacobi Equations\, and Optimal Control(with C. Sinestrari). Cannarsa has given plenary talks at a number of international conferences. Since 2018\, Cannarsa is the President of the Italian Mathematical Union and the Italian coordinator of the LIA COPDESC (Control\, Calculus of Variations\, Nonlinear PDEs\, and Scientific Computing) on Applied Mathematics. Cannarsa is the Editor-in-Chief of the Bollettino dell’Unione Matematica Italiana (Springer) and an editor of several international journals including Evolution Equations and Control Theory (AIMS)\, Mathematical Control and Related Fields (AIMS)\, Minimax Theory and its Applications (Heldermann)\, Nonlinear Analysis: Real World Applications (Elsevier)\, and Nonlinear Differential Equations and Applications (Birkhäuser). \n
URL:https://math.sciences.ncsu.edu/event/piermarco-cannarsa-university-of-rome-tor-vergata-italy-propagation-of-singularities-for-solutions-to-hamilton-jacobi-equations/
LOCATION:SAS 1102
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191025T150000
DTEND;TZID=America/New_York:20191025T160000
DTSTAMP:20191019T162027
CREATED:20190816T192702Z
LAST-MODIFIED:20190816T192702Z
UID:15069-1572015600-1572019200@math.sciences.ncsu.edu
SUMMARY:Moody Chu\, Radmila Sazdanovic
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/moody-chu-radmila-sazdanovic/
LOCATION:SAS 4201
CATEGORIES:First Year Research Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191028T150000
DTEND;TZID=America/New_York:20191028T160000
DTSTAMP:20191019T162027
CREATED:20190816T123059Z
LAST-MODIFIED:20190819T155802Z
UID:14977-1572274800-1572278400@math.sciences.ncsu.edu
SUMMARY:Jason Brown\, Dalhousie University\, Independence Polynomials and Their Roots
DESCRIPTION:Independence polynomials are generating functions for the number of independent sets of each cardinality in a graph G. In addition to encoding useful information about the graph (such as the number of vertices\, the number of edges and the independence number)\, the analytic and algebraic properties can say much about the shape and inter-dependence of the coefficients. In this talk well focus on the nature and location of the roots of such polynomials\, and even cross paths with a fractal or two! This research is joint with Ben Cameron\, Iain Beaton\, Karl Dilcher\, Richard Hoshino and Richard Nowakowski. \n
URL:https://math.sciences.ncsu.edu/event/jason-brown-dalhousie-university/
LOCATION:SAS 4201
CATEGORIES:Algebra and Combinatorics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191029T133000
DTEND;TZID=America/New_York:20191029T143000
DTSTAMP:20191019T162027
CREATED:20190816T221047Z
LAST-MODIFIED:20191017T170246Z
UID:15091-1572355800-1572359400@math.sciences.ncsu.edu
SUMMARY:Sara Maloni Affiliation\, University of Virginia\, Mapping class group actions on character varieties
DESCRIPTION:In the first part of the talk we will discuss famous topological and dynamical questions and conjectures about character varieties and the associated action of the mapping class group. In the second part of the talk we will discuss joint work with F. Palesi and T. Yang about type-preserving representations of the fundamental group of the three-holed projective plane N into PGL(2\, R). First\, we prove Kashaev’s conjecture on the number of connected components with non-maximal euler class. Second\, we discuss Bowditch’s question about which of these components have the following property: there is a a simple closed curve sent to a non-hyperbolic element. Finally\, we show\, in most cases\, that the action of the pure mapping class group Mod(N) on these non-maximal components is ergodic\, proving Goldman conjecture. Time permitting we will discuss a work in progress with Palesi where we expand these results to all five surfaces (orientable and non-orientable) of characteristic -2. \n
URL:https://math.sciences.ncsu.edu/event/sara-maloni-affiliation-university-of-virginia/
LOCATION:SAS 4201
CATEGORIES:Triangle Topology Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191030T121500
DTEND;TZID=America/New_York:20191030T130000
DTSTAMP:20191019T162027
CREATED:20190830T012326Z
LAST-MODIFIED:20190830T012326Z
UID:15628-1572437700-1572440400@math.sciences.ncsu.edu
SUMMARY:AWM Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/awm-brown-bag-lunch-2019-10-02/2019-10-30/
LOCATION:SAS 3281
CATEGORIES:Association for Women in Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191030T143000
DTEND;TZID=America/New_York:20191030T150000
DTSTAMP:20191019T162027
CREATED:20190816T182556Z
LAST-MODIFIED:20190816T182556Z
UID:15048-1572445800-1572447600@math.sciences.ncsu.edu
SUMMARY:Tea and Cookies
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/tea-and-cookies-31/
LOCATION:SAS 4104
CATEGORIES:Departmental Event
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191030T150000
DTEND;TZID=America/New_York:20191030T160000
DTSTAMP:20191019T162027
CREATED:20190906T154126Z
LAST-MODIFIED:20191009T184352Z
UID:15352-1572447600-1572451200@math.sciences.ncsu.edu
SUMMARY:Cass Miller\, UNC\, Toward a New Generation of Models to Simulate Two-Fluid Flow in Porous Media
DESCRIPTION:Two fluid flow in porous medium systems is an important application in many different areas of science and engineering. Overwhelmingly\, it is necessary to mathematically model the behavior of applications of concern at an averaged scale where the juxtaposed position of the phases is not resolved in detail. This length scale is called the macroscale and the traditional model that is used nearly universally was formulated phenomenologically nearly 100 years ago. Since that time\, considerable\, and important\, work has been done to close this model\, advance more efficient numerical methods to solve the resultant equations\, and analyze mathematical aspects of the model behavior. This considerable work notwithstanding\, many important open issues remain with this traditional model\, including hysteretic behavior of the closure relations\, lack of connection between the microscale and the macroscale\, absence of explicit dependence upon variables well known to be important (contact angles\, interfacial tensions\, curvatures\, etc)\, and the absence of thermodynamic constraints. We report on a sustained effort to resolve these theoretical shortcomings and to formulate a new generation of models for this important class of applications. A summary of the theoretical approach based upon the thermodynamically constrained averaging theory (TCAT) is discussed\, a hierarchy of models is formulated\, and an example model instance is examined in detail. The problem of model closure and validation is considered. Relying upon notions from integral geometry\, we formulate a hysteretic-free state equation that applies under both equilibrium and dynamic conditions. We show that this equation is essentially exact by comparing to high-resolution simulations for a wide variety of systems. We extend the notion of a state equation to resistance coefficients\, and we show promising results for the removal of hysteresis from common relative permeability relations as well. We summarize recent results to derive evolution equations for curvatures\, and we assemble the various components to reveal a complete\, closed model. \n
URL:https://math.sciences.ncsu.edu/event/cass-miller-unc/
LOCATION:SAS 4201
CATEGORIES:Differential Equations,Nonlinear Analysis Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191101T153000
DTEND;TZID=America/New_York:20191101T170000
DTSTAMP:20191019T162027
CREATED:20190816T172221Z
LAST-MODIFIED:20190816T190903Z
UID:15003-1572622200-1572627600@math.sciences.ncsu.edu
SUMMARY:Teaching and Diversity Statements
DESCRIPTION:An afternoon discussion/workshop by Jo-Ann Cohen on preparing teaching and diversity statements for the job search. Note unusual time! \n
URL:https://math.sciences.ncsu.edu/event/teaching-and-diversity-statements/
LOCATION:SAS 4201
CATEGORIES:Graduate Training Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191106T121500
DTEND;TZID=America/New_York:20191106T130000
DTSTAMP:20191019T162027
CREATED:20190830T012326Z
LAST-MODIFIED:20190830T012326Z
UID:15629-1573042500-1573045200@math.sciences.ncsu.edu
SUMMARY:AWM Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/awm-brown-bag-lunch-2019-10-02/2019-11-06/
LOCATION:SAS 3281
CATEGORIES:Association for Women in Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191106T143000
DTEND;TZID=America/New_York:20191106T150000
DTSTAMP:20191019T162027
CREATED:20190816T183629Z
LAST-MODIFIED:20190816T183629Z
UID:15051-1573050600-1573052400@math.sciences.ncsu.edu
SUMMARY:Tea and Cookies
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/tea-and-cookies-28/
LOCATION:SAS 4104
CATEGORIES:Departmental Event
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191108T150000
DTEND;TZID=America/New_York:20191108T160000
DTSTAMP:20191019T162027
CREATED:20190816T192748Z
LAST-MODIFIED:20190816T192748Z
UID:15072-1573225200-1573228800@math.sciences.ncsu.edu
SUMMARY:Yerkin Kitapbayev\, David Papp
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/yerkin-kitapbayev-david-papp/
LOCATION:SAS 4201
CATEGORIES:First Year Research Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191111T150000
DTEND;TZID=America/New_York:20191111T160000
DTSTAMP:20191019T162027
CREATED:20190906T191025Z
LAST-MODIFIED:20191016T175656Z
UID:15357-1573484400-1573488000@math.sciences.ncsu.edu
SUMMARY:Thomas McConville\, University of North Carolina at Greensboro
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/thomas-mcconville-university-of-north-carolina-at-greensboro/
LOCATION:SAS 4201
CATEGORIES:Algebra and Combinatorics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191113T121500
DTEND;TZID=America/New_York:20191113T130000
DTSTAMP:20191019T162027
CREATED:20190830T012326Z
LAST-MODIFIED:20190830T012326Z
UID:15630-1573647300-1573650000@math.sciences.ncsu.edu
SUMMARY:AWM Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/awm-brown-bag-lunch-2019-10-02/2019-11-13/
LOCATION:SAS 3281
CATEGORIES:Association for Women in Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191113T143000
DTEND;TZID=America/New_York:20191113T150000
DTSTAMP:20191019T162027
CREATED:20190816T183655Z
LAST-MODIFIED:20190816T183655Z
UID:15052-1573655400-1573657200@math.sciences.ncsu.edu
SUMMARY:Tea and Cookies
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/tea-and-cookies-32/
LOCATION:SAS 4104
CATEGORIES:Departmental Event
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191115T150000
DTEND;TZID=America/New_York:20191115T160000
DTSTAMP:20191019T162027
CREATED:20190816T172146Z
LAST-MODIFIED:20190816T190857Z
UID:15006-1573830000-1573833600@math.sciences.ncsu.edu
SUMMARY:QPR: Suicide Prevention Training
DESCRIPTION:The NCSU Counseling center will provide a training for graduate students and the department for suicide prevention\, using the QPR methodology. As members of the campus educational community\, it is important for all of us to support the mental health of our students. The training will introduce important campus resources. \n
URL:https://math.sciences.ncsu.edu/event/qpr-suicide-prevention-training/
LOCATION:SAS 4201
CATEGORIES:Graduate Training Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191116T090000
DTEND;TZID=America/New_York:20191116T170000
DTSTAMP:20191019T162027
CREATED:20190819T135227Z
LAST-MODIFIED:20190819T135227Z
UID:15117-1573894800-1573923600@math.sciences.ncsu.edu
SUMMARY:Triangle Lectures in Combinatorics
DESCRIPTION:The Triangle Lectures in Combinatorics (TLC) is a series of combinatorial workshops held each semester on a Saturday in the Research Triangle region of North Carolina\, funded by the National Science Foundation. The workshop this coming fall\, the 18th installment of the Triangle Lectures in Combinatorics\, will be hosted by North Carolina State University in Raleigh\, North Carolina on Saturday\, November 16\, 2019. It will include four invited talks as well as coffee breaks and ample time for informal discussions throughout the day. \nConference schedule:\n9:15-10am\, bagels and coffee\n10-11am\, Georgia Benkart\, McKay Quivers in Cooperation with Schur-Weyl Duality\n11-11:30am\, coffee break\n11:30am-12:30pm\, Javier Peña\, Hoffman constants for systems of linear inequalities\n12:30-2:30pm\, lunch break\n2:30-3:30pm\, Margaret Readdy\, Geometric proofs of some combinatorial identities of Morel\n3:30-4pm\, coffee break\n4-5pm\, Alexander Yong\, Complexity\, combinatorial positivity\, and Newton polytopes\n6pm\, informal dinner\n \nTalk titles and abstracts are posted at the conference web site (https://wp.math.ncsu.edu/tlc/) and also appear near the end of this email. \nPre-registration: To pre-register\, please send email to Patricia Hersh at plhersh@ncsu.edu letting her know you plan to attend. \nWe are asking that participants pre-register in advance if at all possible\, the earlier the better\, as pre-registration is very helpful for planning our coffee breaks and obtaining funding to support these meetings. \nParticipant travel funding online application form: \nWe have some travel funding available for some participants\, especially for early-career participants. To apply\, please fill out the funding application form posted at the conference web site (https://wp.math.ncsu.edu/tlc/). The first round of funding decisions will be made in early September. \nPractical information: See the conference website (https://wp.math.ncsu.edu/tlc/) where some practical information (such as hotel and parking information) is posted. The nearest airport\, for those flying\, is the Raleigh-Durham Airport (RDU). \nTitles and abstracts for the talks: \nGeorgia Benkart (University of Wisconsin-Madison) \nTitle: McKay Quivers in Cooperation with Schur-Weyl Duality \nThe well-known McKay Correspondence is a bijection between the finite subgroups G of SU2 and the simply-laced affine Dynkin diagrams. McKay’s insight was that the quivers determined by tensoring the simple G-modules with the G-module V = ℂ2 exactly correspond to the affine Dynkin diagrams of types A\, D\, E. McKay quivers are related to Auslander-Reiten quivers in the representation theory of finite-dimensional algebras and to a host of other topics such as singularity theory and orbifolds. This talk will focus on connecting McKay quivers to Schur-Weyl duality. For any finite group G (or finite-dimensional Hopf algebra) and any finite- dimensional G-module V\, this combined theory provides results on the tensor product module V⊗kand its G-invariants\, and on the centralizer algebra EndG(V⊗k)\, which often has a nice diagrammatic realization and a rich combinatorics. There are applications to chip-firing dynamics and Markov chains. \nJavier Peña (Carnegie Mellon University) \nTitle: Hoffman constants for systems of linear inequalities \nAbstract: A classical result of Hoffman (1952) shows that the distance from a point u to a non-empty polyhedron defined by the system of inequalities Ax ≤ b can be bounded above in terms of the “error” or “residual” (Au-b)+ = max(0\,Au-b). More precisely\, the distance from u to the nonempty polyhedron {x: Ax ≤ b} is bounded above by H(A)*|(Au-b)+| for some Hoffman constant H(A) that depends only on the matrix A. This type of “error bound” plays a fundamental role in mathematical programming. \nThis talk will give a new and constructive proof of existence and characterization of the Hoffman constant H(A). We will discuss our developments in the following more general “relative” context. Suppose R is a “reference” polyhedron representing some easy-to-satisfy constraints such as box constraints. Then the distance from a point u ∈ R to the nonempty polyhedron {x ∈ R: Ax ≤ b} is bounded above by H(A|R)*|(Au-b)+| for some “relative Hoffman constant” H(A|R). \nOur results readily yield a novel combinatorial algorithm to compute Hoffman constants. The latter is a timely but notoriously difficult and largely unexplored computational problem. \nMargaret Readdy (University of Kentucky) \nTitle: Geometric proofs of some combinatorial identities of Morel \nUsing the algebraic and geometric combinatorics of the permutahedron\, we give proofs of combinatorial identities which arise in the technical heart of Morel’s computation of the intersection cohomology of Shimura varieties. No prior background will be assumed. \nThis is joint work with Richard Ehrenborg and Sophie Morel. \nAlexander Yong (U. Illinois at Urbana-Champaign) \nThe Nonvanishing Problem asks if a coefficient of a polynomial is nonzero. Many families of polynomials in algebraic combinatorics admit combinatorial counting rules and simultaneously enjoy having saturated Newton polytopes (SNP). Thereby\, in amenable cases\, Nonvanishing is in the complexity class of problems with “good characterizations”. This suggests a new algebraic combinatorics viewpoint on complexity theory. \nThis talk discusses the case of Schubert polynomials. These form a basis of all polynomials and appear in the study of cohomology rings of flag manifolds. We give a tableau criterion for Nonvanishing\, from which we deduce the first polynomial time algorithm. These results are obtained from new characterizations of the Schubitope\, a generalization of the permutahedron defined for any subset of the n x n grid\, together with a theorem of A. Fink\, K. Meszaros and A. St. Dizier\, which proved a conjecture of C. Monical\, N. Tokcan and the speaker. \nThis is joint with Anshul Adve (U. California\, Los Angeles\, USA) and Colleen Robichaux (U. Illinois at Urbana-Champaign\, USA). \nWe would appreciate if you could forward this announcement to others you know who may be interested in participating. Thanks very much. \nWe hope you will be able to attend! \nFall 2019 TLC Organizing committee: Patricia Hersh (NCSU)\, Gabor Hetyei (UNC Charlotte)\, Kailash Misra (NCSU)\, and Gabor Pataki (UNC Chapel Hill) \n
URL:https://math.sciences.ncsu.edu/event/triangle-lectures-in-combinatorics-4/
LOCATION:SAS 1102
CATEGORIES:Special Events
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191119T133000
DTEND;TZID=America/New_York:20191119T143000
DTSTAMP:20191019T162027
CREATED:20190816T221207Z
LAST-MODIFIED:20190816T221207Z
UID:15093-1574170200-1574173800@math.sciences.ncsu.edu
SUMMARY:Genevieve Walsh\, Tufts University
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/genevieve-walsh-tufts-university/
LOCATION:SAS 4201
CATEGORIES:Triangle Topology Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191120T121500
DTEND;TZID=America/New_York:20191120T130000
DTSTAMP:20191019T162027
CREATED:20190830T012326Z
LAST-MODIFIED:20190830T012326Z
UID:15631-1574252100-1574254800@math.sciences.ncsu.edu
SUMMARY:AWM Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/awm-brown-bag-lunch-2019-10-02/2019-11-20/
LOCATION:SAS 3281
CATEGORIES:Association for Women in Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191122T150000
DTEND;TZID=America/New_York:20191122T160000
DTSTAMP:20191019T162027
CREATED:20190816T172122Z
LAST-MODIFIED:20190816T190851Z
UID:15008-1574434800-1574438400@math.sciences.ncsu.edu
SUMMARY:Interview Strategies Panel
DESCRIPTION:This panel discussion will provide students with interview strategies for different types of jobs (academic\, industrial\, labs\, etc.). Some time will be spent on the environment at the Joint Mathematics Meeting. \n
URL:https://math.sciences.ncsu.edu/event/interview-strategies-panel/
LOCATION:SAS 4201
CATEGORIES:Graduate Training Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191126T120000
DTEND;TZID=America/New_York:20191126T130000
DTSTAMP:20191019T162027
CREATED:20190806T203431Z
LAST-MODIFIED:20190816T120948Z
UID:14947-1574769600-1574773200@math.sciences.ncsu.edu
SUMMARY:Diversity and Inclusion Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/diversity-and-inclusion-brown-bag-lunch-10/
LOCATION:SAS 4201
CATEGORIES:Diversity and Inclusion in Mathematical and Statistical Sciences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191127T121500
DTEND;TZID=America/New_York:20191127T130000
DTSTAMP:20191019T162027
CREATED:20190830T012326Z
LAST-MODIFIED:20190830T012326Z
UID:15632-1574856900-1574859600@math.sciences.ncsu.edu
SUMMARY:AWM Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/awm-brown-bag-lunch-2019-10-02/2019-11-27/
LOCATION:SAS 3281
CATEGORIES:Association for Women in Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191204T121500
DTEND;TZID=America/New_York:20191204T130000
DTSTAMP:20191019T162027
CREATED:20190830T012326Z
LAST-MODIFIED:20190830T012326Z
UID:15633-1575461700-1575464400@math.sciences.ncsu.edu
SUMMARY:AWM Brown Bag Lunch
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/awm-brown-bag-lunch-2019-10-02/2019-12-04/
LOCATION:SAS 3281
CATEGORIES:Association for Women in Mathematics
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191204T143000
DTEND;TZID=America/New_York:20191204T150000
DTSTAMP:20191019T162027
CREATED:20190816T183754Z
LAST-MODIFIED:20190816T183754Z
UID:15056-1575469800-1575471600@math.sciences.ncsu.edu
SUMMARY:Tea and Cookies
DESCRIPTION:
URL:https://math.sciences.ncsu.edu/event/tea-and-cookies-33/
LOCATION:SAS 4104
CATEGORIES:Departmental Event
END:VEVENT
END:VCALENDAR