# Calendar

Feb
16
Fri
Logic seminar: David Webb
Feb 16 @ 2:30 pm – 3:30 pm

Continuing the theme of symbolic dynamics, I will demonstrate a proof of Simpson’s result that “Entropy = Dimension” for N^d and Z^d, and discuss some of Adam Day’s work generalizing these results to amenable groups.

Feb
23
Fri
Logic seminar: Umar Gaffar @ Keller 314
Feb 23 @ 2:30 pm – 3:30 pm

This week Umar Gaffar will give Shelah’s proof of the following result:

Let $\lambda$ be the cardinality of an ultraproduct of finite sets. If $\lambda$ is infinite then $\lambda=\lambda^{\aleph_0}$.

Mar
9
Fri
Logic seminar: Mushfeq Khan
Mar 9 @ 2:30 pm – 3:30 pm
Mar
16
Fri
Logic seminar: Mushfeq Khan
Mar 16 @ 2:30 pm – 3:30 pm
Mar
23
Fri
Logic seminar: Amenability and Symbolic Dynamics @ Keller Hall 314
Mar 23 @ 2:30 pm – 3:30 pm

David Webb will continue to discuss results from Adam Day’s paper on amenability and symbolic dynamics.

Apr
6
Fri
Logic seminar: David Ross
Apr 6 @ 2:30 pm – 3:30 pm

This week in the Logic Seminar in Keller 314, David Ross will give an easy proof of a slight extension of a result of Lagarias on the Diophantine equation

$$c(1/x_1+cdots+1/x_s)+b/(x_1 x_2cdots x_s)=a$$

The proof will be nonstandard, but really only require a sufficiently-saturated ordered field extension of $mathbb R$.

Apr
13
Fri
Logic seminar: Mushfeq Khan @ Keller 314
Apr 13 @ 2:30 pm – 3:30 pm

Mushfeq Khan will coninue to speak on amenability and symbolic dynamics.  The focus will be the Ornstein-Weiss combinatorial