Infosheet (October 31st, 2017) |
Queen's University - Department of Mathematics and Statistics |
Wednesday, November 1 |
Number Theory Seminar Time: 1:30 p.m. Place: Jeffery 319 |
Speaker: Siddhi Pathak Title: On a conjecture of Erdos Abstract Attached |
Friday, November 3 |
Graduate Student Seminar Time: 11:30 a.m. Place: Jeffery 422 |
Speaker: Pei-Lun Tseng Title: Glimpse of Free Probability Abstract Attached |
Friday, November 3 |
Department Colloquium Time: 2:30 p.m. Place: Jeffery 234 |
Speaker: Abdolnasser Sadeghkhani, Queen’s University Title: Bayesian Predictive Density Estimation with Additional Information Abstract Attached |
Monday, November 6 |
Dynamics Seminar Time: 4:00 p.m. Place: Jeffery 422 |
Speaker: Thomas Barthelmé Title: Fubini’s nightmare: Katok’s original example Abstract Attached |
Monday, November 6 |
Geometry and Representation Theory Seminar Time: 4:45 p.m. Place: Jeffery 319 |
Speaker: Charles Paquette, RMC Title: Homological dimensions of algebras Abstract Attached |
Friday, November 24 |
Ph.D. Thesis Defense Time: 10:00 a.m. Place: Jeffery 521 |
Ph.D. Student: Aaron Springford Title: Spectral analysis of time series with latent and irregular times Supervisors: D. Thomson and G. Takahara |
Items for the Info Sheet should reach Anne ( burnsa@queensu.ca) by noon on Monday. The Info Sheet is published every Tuesday.
Wednesday, November 1, 1:30 p.m. Jeffery 319 - Number Theory Seminar
Speaker: Siddhi Pathak
Title: On a conjecture of Erdos
Abstract: In a written correspondence with A. Livingston in the 1960s, Erdos conjectured that for an arithmetic function f, periodic with period q satisfying: (i) f(n) is 1 or -1 if q does not divide n and (ii) f(n) = 0 if q divides n, the series \sum_{n=1}^{\infty} f(n)/n is not zero (and hence, evaluates to a transcendental number) whenever it converges. In 2007, this conjecture was proved by M. Ram Murty and N. Saradha for q congruent to 3 modulo 4 and is still open when q is congruent to 1 modulo 4. In this talk, we present some new developments toward this conjecture.
Friday, November 3, 11:30 a.m. Jeffery 422 - Graduate Student Seminar
Speaker: Pei-Lun Tseng
Title: Glimpse of Free Probability
Abstract: In this talk, we will introduce a key concept in free probability called free independence. Then we will compare the difference between classical and free probability. Moreover, we will give some applications of free probability in random matrix theory.
Friday, November 3, 2:30 p.m. Jeffery 234 - Department Colloquium
Speaker: Abdolnasser Sadeghkhani
Title: Bayesian Predictive Density Estimation with Additional Information
Abstract: In the context of Bayesian theory and decision theory, the estimation of a predictive density of a random variable represents an important and challenging problem. Often the times there is some additional information at our disposal which is unduly being ignored. In this talk, we deal with strategies to take into account this kind of information, in order to obtain effective and sometimes better performing predictive densities than others in the literature.
Monday, November 6, 4:00 p.m. Jeffery 422 - Dynamics Seminar
Speaker: Thomas Barthelmé
Title: Fubini’s nightmare: Katok’s original example
Abstract: We'll present Katok's example of Fubini's nightmare: a set of full Lebesgue measure E in the unit square (0,1) \times [0,1] that intersects each leaf of a (continuous) foliation (with analytic leaves) of the square in only one point.
Monday, November 6, 4:45 p.m. Jeffery 319
Geometry and Representation Theory Seminar
Speaker: Charles Paquette
Title: Homological dimensions of algebras
Abstract: Homological algebra is a relatively new branch of mathematics that made its origin when considering some problems in topology, and it was formalized by Cartan and Eilenberg in their book "Homological Algebra". Given an associative (and unital) algebra A, we are interested in approximating the A-modules by ideal ones (the projective or injective A-modules). The global dimension of an algebra measures how far we should go if we want to approximate our modules with projective ones. In this talk, I will consider the global dimension of an algebra, and mainly focus on finite dimensional algebras. I will give some necessary or sufficient conditions for an algebra to have finite global dimension.