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...
This talk will sketch the history of academic study of China in
the U.S., beginning in 1920, with attention to how it differed from
European Sinology. I see it as a story with intersecting
trajectories, including U.S.-China relations and...
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...
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)?
Max Meyerhof, born in 1874 as the only son of a German-Jewish
family in Hildesheim, spent half his life in Cairo, where he died
in 1945, shortly before the end of the war. He practiced as a
successful ophthalmologist, who was said to be able to cure...
In certain time-dependent backgrounds there are nonstandard
light strings that are created classically at an instant and cannot
be approximated by particles. We discuss the implications of these
strings to black holes and cosmology.
