## Seminars and Colloquiums for the week of October 26, 2015

SPEAKER:

Vajira Manathunga, UTK, Monday
Mark Bly, UTK, Monday
Faith Celiker, Wayne State University, Thursday
Andrew Belt, UTK, Thursday
Jordan Bush, UTK, Friday
Chase Worley, UTK, Friday
Qiang Du, Columbia University, Friday

Tea Time, Monday - Wednesday, 3:00 pm
Hosted by Bonnie, Cara, & Tricia

Monday October 26

GEOMETRY/TOPOLOGY SEMINAR
TITLE: Extracting integer invariants from a power series expansion of the Jones polynomial
TIME: 2:30 – 3:20pm
ROOM: Ayres 114
SPEAKER: Vajira Manathunga (UTK)
Abstract: It is known that appropriate change of variable of Jones polynomial followed by Taylor series expansion gives an infinite power series with coefficients that are Vassiliev invariants. However these Vassiliev invariants are rational valued. We can convert them to integer valued Vassiliev invariants by multiplying it with appropriate constant $\lambda_k$. In this talk we give a formula for minimal $\lambda_k$ when $k$ is even.

ALGEBRA SEMINAR
TITLE: Projective modules and Hermite rings
TIME: 3:35 – 4:25pm
ROOM: Ayres 114
SPEAKER: Mark Bly, UTK
Abstract: This and the next few talks explain Suslin's proof of Serre's conjecture on projective modules.

Tuesday October 27

STOCHASTICS SEMINAR -- Canceled

Wednesday October 28

COMPUTATIONAL & APPLIED MATHEMATICS (CAM) SEMINAR -- Canceled

Thursday October 29

DIFFERENTIAL EQUATIONS SEMINAR
TITLE: Incorporating local boundary conditions into nonlocal theories
TIME: 2:10 – 3:25pm
ROOM: Ayres 114
SPEAKER: Faith Celiker, Wayne State University
Abstract: We study nonlocal wave equations on bounded domains related to peridynamics.  We generalize the standard integral based convolution to an abstract convolution operator defined by a Hilbert basis. This operator is a function of the classical operator which allows us to incorporate local boundary conditions into nonlocal theories. We present a numerical study of the solutions. For discretization, we employ a weak formulation based on a Galerkin projection which allows discontinuities on element boundaries

JUNIOR COLLOQUIUM
TITLE: Algebra in Cryptography
TIME: 3:40 – 4:30pm
ROOM: Ayres 405
SPEAKER: Andrew Belt, UTK
Abstract: Group theory is the foundation of most modern cryptographic algorithms used on the Internet and in mobile communications. As computers become faster, parties can increase the power of their cryptography, usually resulting in a larger underlying group. As this power is increased, encryption and decryption become slower, but cracking the system often takes exponentially more time, so a balance of security and convenience can always be reached. However, in the near future, the quantum model of computation may break this balance, allowing security to be compromised in approximately the same time as encrypting the message. Thus there is motivation for developing new systems of cryptography based on more exotic groups with the goal of making encryption fast on classical computers and attacks hard on both computation models. A broad overview of classical cryptography and their known attacks will be given, in addition to lesser-known alternative methods.

Friday October 30

MATH BIOLOGY SEMINAR
TITLE: Social personality polymorphism and the spread of invasive species: a model (paper by Fogarty et al).
TIME: 10:10 – 11:00am
ROOM: Ayres 405
SPEAKER: Jordan Bush, UTK

ANALYSIS SEMINAR
TITLE: Circulant Core Hadamard Matrices, Part II
TIME: 2:30- 3:20pm
ROOM: BU 476
SPEAKER: Chase Worley, UTK
Abstract: This is a continuation of my previous talk.  We will begin by discussing Hadamard matrices with both real and complex entries.  After dephasing a Hadamard matrix, we can examine the properties of the core of the matrix. We investigate the Hadamard matrices whose core is circulant. We give examples coming from Number Theory.  Then we prove a finiteness result for circulant core Hadamard matrices of size p+1 when p is a prime number.

COLLOQUIUM AND HOUSEHOLDER DISTINGUISHED LECTURE
TITLE: Application of Householder transform to transition state search
TIME: 3:35 -4:25pm
ROOM: Ayres 405
SPEAKER: Qiang Du, Columbia University
Abstract: Finding transition states on a complex energy landscape is an interesting computational problem that appears in many applications. This lecture will discuss how Householder transform plays a useful role in the design of robust algorithms for effective transition state search. Rigorous mathematical analysis of such algorithms will be presented along with some discussion on various applications.

### If you are interested in giving or arranging a talk for one of our seminars or colloquiums, please review our calendar.

If you have questions, or a date you would like to confirm, please contact colloquium AT math DOT utk DOT edu

###### last updated: May 2018

Department of Mathematics
College of Arts & Sciences

227 Ayres Hall. 1403 Circle Drive. Knoxville TN 37996-1320
Phone: 865-974-2461 Fax: 865-974-6576 Email: math_info@utk.edu

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