This event is from the archives of The Notice Board. The event has already taken place and the information contained in this post may no longer be relevant or accurate.
Lethbridge Number Theory and Combinatorics Seminar
Date:
September 19, 2016
Time:
12:00-12:50pm
Lecturer(s):
Hadi Kharaghani
Location:
University of Lethbridge
Topic:
The Strongly Regular Graph SRG(765,192,48,48)
Description (in plain text format):
Andries Brouwer is 65 and a special issue of Designs, Codes and Cryptography is issued to celebrate the occasion.
Professor Brouwer maintains an elegant public database of existence results for all possible strongly regular graphs on n < 1300 vertices. In a very nice paper, Cohen and Pasechnik implemented most of the graphs listed there in the open source software Sagemath and obtained a graph for each set of parameters mentioned in the database. In their initial version of the paper, they mentioned 11 cases as missing values. A number of the cases were related to my work with professors Janko, Tonchev, and Ionin. I tried to help out with these cases and four cases were resolved quickly, after I sent detailed instructions. However, there was a problem with the case of SRG(765,192,48,48). This talk relates to this special case and a nice application of generalized Hadamard matrices.
To make the talk accessible to general audiences, I will provide many examples illustrating the concepts involved.
Other Information:
Location: C756 University Hall
Web page: http://www.cs.uleth.ca/~nathanng/ntcoseminar/
Contact:
Barb Hodgson | hodgsonb@uleth.ca | (403) 329-2470 | uleth.ca/artsci/math-computer-science
