# Seminars and colloquia

E.g., Oct. 1, 2022

### Kee Yuen Lam

UBC
Intercalate matrices and the Yuzvinsky Conjecture

October 4, 2022

ESB 4127

The property |z||w| = |zw| of complex numbers leads naturally to the following question concerning sums of squares: in the polynomial ring R = Z[x_1,...,x_r, y_1,... y_s], what is the minimal n such that [(x_1)^2 + ... +(x_r)^2] [(y_1)^2 + ... +(y_s)^2] can be expressed as a ... Read more
• Discrete mathematics

### Kyle Yip

UBC
Cyclotomic polynomials and intersective sets over abelian groups

October 11, 2022

ESB 4127

Given a finite abelian group $G$ and a subset $J\subset G$ with $0\in J$, let $D_{G}(J,N)$ be the maximum size of $A\subset G^{N}$ such that the difference set $A-A$ and $J^{N}$ have no non-trivial intersection. In this talk, I will describe some recent progress on this S\'ark ... Read more
• Discrete mathematics

### Farid Aliniaeifard

UBC
TBA

November 8, 2022

ESB 4127

• Discrete mathematics

### Stephanie van Willigenburg

UBC
Schur functions in noncommuting variables

November 29, 2022

ESB 4127

In 2004 Rosas and Sagan asked whether there was a way to define a basis in the algebra of symmetric functions in noncommuting variables, NCSym, having properties analogous to the classical Schur functions, in the algebra of symmetric functions, Sym. Despite attempts, this ... Read more
• Discrete mathematics