Department of Mathematics and Computer Science
Number Theory and Combinatorics Seminar
Fall 2014
Talks are at noon on Monday in room B660 of University Hall
For more information, or to receive an email announcement of each week's seminar,
contact Nathan Ng < ng AT cs DOT uleth DOT ca > or Dave Morris <>.
                The next talk:

Dec 1
at noon
in UHall B660
Dave Morris
(University of Lethbridge)
Introduction to arithmetic groups
We will discuss a few basic properties of "arithmetic groups," which are certain groups of \(n \times n\) matrices with integer entries. By definition, the subject combines algebra (group theory and matrices) with number theory (the integers), but it also has connections with other areas, including the theory of periodic tilings. To learn more about these interesting groups, download a free copy of my book from

Talks in the series this semester:
(Click on any title for more info, including the abstract. Then click on it again to hide the info.)

Date Speaker Title

Sept 8 everyone Open problem session

Sept 15 Joy Morris Colour-permuting automorphisms of Cayley graphs

Sept 22 Farzad Aryan On Binary and Quadratic Divisor Problem

Sept 29 Adam Tyler Felix Common divisors of the index and order of \(a\) modulo \(p\)

Oct 6 Nathan Ng Inclusive Prime Number Races

Oct 20 Sean Fitzpatrick Characters of induced representations

Oct 27 Kevin Henriot Linear equations in dense subsets of the squares

Nov 3 Amir Akbary Heuristics for Some Conjectural Constants

Nov 10 James Parks Averages of the number of points on elliptic curves

Nov 17 Manoj Kumar The Signs in an Elliptic Net

Nov 21 Soroosh Yazdani Belyi maps and Diophantine Equations
(Waterloo, ON)

Dec 1 Dave Morris Introduction to arithmetic groups
Past semesters: Fall 2007 Fall 2008 Fall 2009 Fall 2010 Fall 2011 Fall 2012 Fall 2013
Spring 2008 Spring 2009 Spring 2010 Spring 2012 Spring 2013 Spring 2014