## October 7, Hyun-Kyoung Kwon, University of Alabama

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- Category: 2016-2017

Abstract: The original proof of the Corona Theorem is due to L. Carleson and many different versions and generalizations of the Corona Theorem have been investigated. I will discuss one such generalization recently obtained with my graduate student. I will also explain how the technique widely used to solve the Corona problems can be applied to get results about operator equivalence (unitary equivalence and similarity) and about the degree bound in Hilbert's Nullstellensatz.

## September 30, Kabe Moen, University of Alabama

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- Category: 2016-2017

Abstract: We survey some basic facts about Lebesgue spaces. We show that the union of Lebesgue spaces is intimately related to the Hardy-Littlewood maximal function and the theory of weighted Lebesgue spaces -- Lebesgue spaces with a change of measure. We give several simple characterizations of when a function belongs the union Lebesgue spaces. This presentation will be based on a joint work with Greg Knese and John McCarthy.

## September 23, Jesse Prince-Lubawy, University of North Alabama

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- Category: 2016-2017

Abstract: A handlebody orbifold consists of finitely many quotients of the 3-ball by spherical groups (

**,**

*Z*_{n}**,**

*D*_{n}**,**

*A*_{4}**, and**

*S*_{4}**) connected by 1-handle orbifolds respecting singular axes and their orders, and such that topologically the outcome is an orientable handlebody. We will first examine the handlebody of genus two,**

*A*_{5}*V*, and the handlebody orbifolds

_{2}*V*/

_{2}*G*, where

*G*is a finite group. We will then discuss equivalence of group actions and see that, up to equivalence, there are 13 actions on

*V*. This will lead into my work, where we consider cyclic

_{2}*p*-squared actions, where

*p*is prime, on a handlebody of genus

*g*.

## September 16, Ted Mahavier, Lamar University

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- Category: 2016-2017

Abstract: Solving differential equations using steepest descent methods based on the Euclidean norm has long been established as ineffective, although pre-conditioning techniques may alleviate this problem to some extent. However, steepest descent in spaces with a better choice of norm can be quite efficient. Beginning with an example accessible to undergraduates, we will outline Sobolev descent on a few elementary examples and demonstrate at least one interesting open problem in the area. This talk should be accessible to undergraduates, graduate students and faculty not necessarily experts in numerical differential equations.