Department of Mathematics and Computer Science  
Number Theory and Combinatorics Seminar  
Fall 2023  
For more information,
contact
Félix Baril Boudreau
<felix.barilboudreau@uleth.ca>
or Ertan Elma <ertan.elma@uleth.ca>. Talks are usually at 2pm on Tuesday in room M1060 (Markin Hall). All times are Mountain Time.  
The live access zoom link is available here and on researchseminars.org, and is also sent to our mailing list. 
The next talk:  


Oct 3
at 2pm in M1060 
Kübra Benli
(University of Lethbridge) 
Sums of proper divisors with missing digits
In 1992, Erdős, Granville, Pomerance, and Spiro conjectured that if $\mathcal{A}$ is a set of integers with asymptotic density zero then the preimage of $\mathcal{A}$ under $s(n)$, sumofproperdivisors function, also has asymptotic density zero. In this talk, we will discuss the verification of this conjecture when $\mathcal{A}$ is taken to be the set of integers with missing digits (also known as ellipsephic integers) by giving a quantitative estimate on the size of the set $s^{1}(\mathcal{A})$. This is joint work with Giulia Cesana, Cécile Dartyge, Charlotte Dombrowsky and Lola Thompson. 
Click on any title for more info, including the abstract. Then
click on it again to hide the info.
When available, click on the mathtube icon to access a videorecording of the talk. 
Date  Speaker  Title  


Sept 12  everyone  Organizational meeting and problem session  


Sept 19  Gabriel Verret  Vertextransitive graphs with large automorphism groups  
(University of Auckland, New Zealand)  


Sept 26  Sedanur Albayrak  Quantitative estimates for the size of an intersection of sparse automatic sets  
(University of Calgary)  


Oct 3  Kübra Benli  Sums of proper divisors with missing digits  


Oct 12  Wanlin Li  Basic reductions of abelian varieties  
Thursday 
(Washington University, 



Oct 17  Hiva Gheisari  Title TBA  


Oct 25  YuRu Liu  Title TBA  
(University of Waterloo)  


Oct 31  Joy Morris  Easy detection of (Di)Graphical Regular Representations  


Nov 7  Abbas Maarefparvar  Title TBA  


Nov 21  Sreerupa Bhattacharjee  Title TBA  


Nov 28  Ha Tran  Title TBA  
(Concordia University of Edmonton)  


Dec 5  Speaker TBA  Title TBA  

Past semesters:  Fall  F07  F08  F09  F10  F11  F12  F13  F14  F15  F16  F17  F18  F19  F20  F21  F22 
Spring  S08  S09  S10  S12  S13  S14  S15  S16  S17  S18  S19  S20  S21  S22  S23 
Click here for a PDF file of abstracts of all talks back to 2007 (approx 450K). 