# Upcoming Events

A *parking function *of length *n *is a sequence *a*1*,** **a*2*,** **. . . , a**n** *of positive integers whose increasing rearrangement *b*1 ≤ *b*2 ≤ · ·…

Let *R *be a commutative ring (with identity) and *A *an *n *× *n *matrix over *R*. Suppose there exist *n *× *n *matrices *P,** **Q *invertible over *R *for which *PAQ *is a…

Abstract: Z/2 harmonic forms are closed and coclosed 1-forms with values in a real line bundle that is defined on the complement of a cxdimension 2 subvariety of a Riemannian manifold with their norms being zero on this same subvariety. These objects are now known…

Z/2 harmonic forms are closed and coclosed 1-forms with values in a real line bundle that is defined on the complement of a cxdimension 2 subvariety of a Riemannian manifold with their norms being zero on the same subvariety. These objects are now known to appear (in dimensions 2-4) in diverse…

What is the effect of excluding an induced subgraph on the global structure of a graph? While there do not seem to be general structural consequences, a conjecture of Erdős and Hajnal says that graphs with forbidden induced subgraphs behave very differently from general graphs; more…

Not actual date of lecture. Date is TBA

Actual date of lecture TBA