The three problems referred to in the title originate in the
theory of von Neumann algebras, C* algebras, and quantum
information theory respectively. Each of them has been a deep
long-standing open problem in its respective area. Surprisingly,
the...
In the first story we wonder about the ubiquity of the
free field and look at a few characterisation theorems. In the
second story we discuss the mutually benefiting relationship
between the discrete free field and the O(N) spin model. Finally,
in...
In this talk we discuss the existence of a new type of rigidity
of symplectic embeddings coming from obligatory intersections with
symplectic planes. This is based on a joint work with P.
Haim-Kislev and R. Hind.
We consider general two-dimensional autonomous velocity fields
and prove that their mixing and dissipation features are limited to
algebraic rates. As an application, we consider a standard cellular
flow on a periodic box, and explore potential...
Complex dynamics explores the evolution of points under
iteration of functions of complex variables. In this talk I will
introduce into the context of complex dynamics, a new approximation
tool allowing us to construct new examples of entire...
Suppose you have a set S of integers from {1 , 2 , … , N} that
contains at least N / C elements. Then for large enough N , must S
contain three equally spaced numbers (i.e., a 3-term arithmetic
progression)?
Embedded contact homology (ECH) is a diffeomorphism invariant of
three-manifolds due to Hutchings, defined using a contact form.
This very diffeomorphism invariance makes it quite useful when
studying contact dynamics, because it is possible to...
The rigorous study of spin systems such as the Ising model is
currently one of the most active research areas in probability
theory. In this talk, I will introduce one particular class of such
models, known as lattice gauge theories (LGTs), and go...
Extremal combinatorics is a central research area in discrete
mathematics. The field can be traced back to the work of Turán and
it was established by Erdős through his fundamental contributions
and his uncounted guiding questions. Since then it has...
