Unraveling local cohomology

Speaker: 

Emily Witt

Institution: 

University of Kansas

Time: 

Monday, January 27, 2020 - 3:00pm to 3:50pm

Location: 

RH 306

Local cohomology modules are fundamental tools in commutative algebra, due to the algebraic and geometric information they carry. For instance, they can help determine the number of equations necessary to define an affine variety. Unfortunately, however, the application of local cohomology is limited by the fact that these modules are typically very large (e.g., not finitely generated), and can be difficult to determine explicitly. In this talk, we discuss new techniques developed to understand the structure of local cohomology (e.g., coming from invariant theory).  We also describe recently- discovered "connectedness properties" of spectra that local cohomology encodes.

Moments in families of L-functions

Speaker: 

Alexandra Florea

Institution: 

Columbia University

Time: 

Friday, January 24, 2020 - 3:00pm to 3:50pm

Location: 

RH 306

The moments of the Riemann zeta function were introduced by Hardy and Littlewood more than 100 years ago, in an attempt to prove the Lindelöf hypothesis, which provides a strong upper bound on the size of the Riemann zeta function on the critical line. Since then, moments became central objects of study in number theory. I will give an overview of the problem of computing moments in different families of L-functions, and I will discuss some of the applications. For example, I will explain how one can extract information about the values of L-functions at special points by computing moments of the L-functions in question.

Compactifying moduli spaces in algebraic geometry

Speaker: 

Ken Ascher

Institution: 

Princeton

Time: 

Tuesday, January 21, 2020 - 3:00pm to 3:50pm

Location: 

306 RH

Algebraic geometry is concerned with algebraic varieties, which can be understood as solution sets of polynomial equations. At the heart of research is the classification of algebraic varieties, and a geometric solution is provided in the form of a moduli space. Roughly speaking, a moduli space is itself an algebro-geometric object whose points represent equivalence classes of algebraic varieties of a fixed type. This talk begins with the moduli space of curves, which parametrizes equivalence classes of complex algebraic curves (i.e. Riemann surfaces) of a fixed genus. This moduli space, like most moduli spaces appearing in algebraic geometry, is not a compact space. A celebrated result of Deligne and Mumford provides a geometric way to compactify this space. The goal of this talk is to discuss recent progress towards compactifying moduli spaces of higher dimensional complex algebraic varieties (e.g. complex algebraic surfaces).

Searching for the spectrum of a non-commutative algebra.

Speaker: 

Manuel Reyes

Institution: 

Bowdoin College

Time: 

Wednesday, January 8, 2020 - 4:00pm to 4:50pm

Location: 

RH 306

The spectrum of a commutative algebra is a geometric or topological space on which the algebra may be viewed as a ring of functions. Spectrum constructions for various classes of commutative algebras famously provide a bridge between algebra and geometry, serving as one of the primary inspirations for various flavors of noncommutative geometry. But what kind of object should fill the role of the spectrum of a noncommutative algebra? In recent years, a number of results have ruled out both naive and subtle attempts to resolve this problem. This suggests that we frame the problem in light of a more fundamental question: What objects should serve as quantum discrete spaces in noncommutative geometry? In this talk, I will survey various obstructions and partial progress on these problems in both ring theory and operator algebra.

Rigid subalgebras of s-malleable deformations

Speaker: 

Rolando de Santiago

Institution: 

UCLA

Time: 

Thursday, January 9, 2020 - 4:00pm to 5:00pm

Location: 

RH 306

The works of F. Murray and J. von Neumann outlined a procedure to associate a von Neumann algebra to a group. Since then, an active area of research investigates which structural aspects of the group are detectable in its von Neumann algebra.  The difficulty of this problem is best illustrated by Conne's landmark result which states all countable ICC amenable groups give rise to isomorphic objects.  In essence, standard group invariants alone are typically too weak to be detectable the resulting von Neumann algebra.  However, when the group is non-amenable the situation may be strikingly different.

 

This talk surveys advances made in this area, with an emphasis on the results stemming from Popa's deformation/rigidity theory.  I present several instances where elementary structural features of a group, such as the direct product, can be recovered from the algebra.  We will then discuss recent progress made by Ben Hayes, Dan Hoff, Thomas Sinclair and myself on the analysis of s-malleable deformations, in the sense of Popa,  of tracial von Neumann algebras and its relationship to $\ell^2$ cohomology theory of groups.    Finally, we will detail the applications of our work which may resolve open conjectures of Peterson and Thom for von Neumann algebra of the free group $\mathbb{F}_2$.

Active learning in the UCI classroom and through independent research projects

Speaker: 

Nicole Fider

Institution: 

University of California, Irvine

Time: 

Friday, February 8, 2019 - 3:00pm to 4:00pm

Location: 

RH 306

Active learning is, in essence, any teaching strategy that encourages students to take an active part in the learning process.  Research suggests that active learning is a beneficial addition to the STEM curriculum—it promotes a deeper level of understanding and may help improve the retention rates of STEM majors.  To demonstrate how active learning components can be utilized in UCI mathematics courses, I present materials I developed and implemented for upper and lower division courses at UCI.  These materials span an assortment of media and are designed to facilitate student engagement in a variety of ways.  I also discuss ideas for future active learning opportunities in UCI mathematics courses, and I summarize potential undergraduate projects, which will allow students to explore advanced mathematics and applications (including work with real world data) in a hands-on exploratory fashion.

Curriculum Development and Undergraduate Research in the Middle of the Pacific

Speaker: 

Roberto Pelayo

Institution: 

University of Hawaii at Hilo

Time: 

Monday, February 4, 2019 - 3:00pm to 4:00pm

Location: 

RH 306

Crafting mathematics curriculum and creating research opportunities for undergraduates have been central to my academic career.  In this talk, I discuss my experiences in these areas while at the University of Hawai`i at Hilo and how I envision incorporating them at UC Irvine.   I will begin by describing my role in creating and directing the UH Hilo Data Science program and generating an interdisciplinary curriculum that serves the needs of students with interdisciplinary interests.  Then, I will describe my work as undergraduate research advisor and principal investigator for the Pacific Undergraduate Research Experience in Mathematics (PURE Math), a 5-year REU housed at UH Hilo targeting underrepresented mathematics majors.  I will end by describing much of my educational outreach work, which centers on developing a high school curriculum for the state of Hawai`i and for the College Board, as well as providing professional learning and mentoring for in-service teachers around the country. 

Adaptivity: From Applied Math Research to Training Undergraduates for Big Data Epoch

Speaker: 

Shuhao Cao

Institution: 

University of California, Irvine

Time: 

Tuesday, January 29, 2019 - 3:00pm to 4:00pm

Location: 

RH 440R

Adaptive methods are used in almost all disciplines of applied and computational mathematics, where the problem solving procedure adapts to the feedback from the quantities of interest. Inspired by this methodology, we will discuss the practice of the adaptive education, and the adaptive design of classes for the data science specialization. With the help of the smart classroom technologies at UC Irvine, we can better execute the instruction of programming in mathematics and data science to make our students learn to be more competent for both industry and graduate school.  Lastly, we share some ideas of future plans to further strengthen our strong undergraduate program and serve our community.

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