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# AMCS Seminars

## Upcoming Seminars

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## Past Seminars

### GAUSS Seminar: Numbers and Games [hybrid]

Tuesday, November 2, 2021 3:30pm to 4:20pm

Schaeffer Hall

Abstract
This talk will focus itself on games. Some basic games will be introduced and their strategies analyzed. We will scratch the surface of combinatorial game theory, a lovely, playful, and often overlooked branch of mathematics. In the process we will stumble upon the surreal numbers and explore the very nature of “numbers”. This talk will be accessible for all audiences. There is no prerequisite knowledge needed, just an open mind.

**We will have milk and cookies! Remember to bring your**...### Colloquium - Programming Languages Techniques for Controlling Generalization Errors in Adaptive Data Analysis

Friday, October 22, 2021 4:00pm to 5:00pm

Virtual

Speaker
Marco Gaboardi (Boston University)
Abstract
Data analysts aim at guaranteeing that the result of a data analysis run on sample data does not differ too much from the result one would achieve by running the analysis over the entire population. To achieve this goal, they have developed several techniques to control the generalization errors of their data analyses. In this talk, I will discuss how programming language techniques can help data analysts to design adaptive data analyses...

### Colloquium - On Feature Learning in Neural Networks: Emergence from Inputs and Advantage over Fixed Features

Friday, October 15, 2021 4:00pm to 5:00pm

Virtual

Speaker
Yingyu Liang
Abstract
An important characteristic of neural networks is their ability to learn representations of the input data with effective features for prediction, which is believed to be a key factor to their superior empirical performance. To better understand the source and benefit of feature learning in neural networks, we consider learning problems motivated by practical data, where the labels are determined by a set of class relevant patterns and the inputs are generated...

### GAUSS Seminar: Puzzles, Ice, & Grothendieck Polynomials [hybrid]

Tuesday, October 5, 2021 3:30pm to 4:20pm

Schaeffer Hall

Abstract
We introduce quivers, path algebras and their representations. Then, in the case when our ground field is algebraically closed, we discuss a particular Morita invariant of path algebras arising from finite quivers, the Ext quiver of the category. Through examples we see how to compute the Ext quiver using quiver representations and techniques from linear algebra. We aim to keep the talk accessible to undergraduate and graduate students alike.
Speaker
Ryan Bianconi UI Mathematics PhD...

### GAUSS Seminar: Puzzles, Ice, & Grothendieck Polynomials

Tuesday, September 21, 2021 3:30pm to 4:20pm

Schaeffer Hall

Abstract
From a summer REU at the University of Minnesota, we constructed a solvable lattice model for the dual weak symmetric Grothendieck polynomials in hopes of using such a model to prove related properties of these polynomials, including Cauchy identities and branching rules. We also considered a similar lattice model construction for the weak symmetric Grothendieck polynomials in hopes of proving a Cauchy identity, concluding with a negative result. Moreover, we expand on previous work by...

### GAUSS Seminar: Rotation Symmetric Boolean Functions and its Matrix

Tuesday, September 14, 2021 3:30pm to 4:20pm

Schaeffer Hall

Abstract
Digital signatures are an important feature in any encryption/decryption scheme, as it provides a message with integrity, authenticity, and nonrepudiation. The problem occurs when long messages are being exchanged and signatures that are just as long need to be verified. By using hash functions, a ”fingerprint” of the message can be used instead of the message itself for verification, making the process computationally inexpensive. If we consider a single iteration of a general hashing...

### Colloquium - Diderot: A Parallel Domain-Specific Language for Image Analysis and Visualization

Friday, September 10, 2021 4:00pm to 5:00pm

MacLean Hall

Speaker
John Reppy
Abstract
The analysis of structure in three-dimensional images is increasingly valuable for biomedical research and computational science. At the same time, the computational burden of processing images is increasing as devices produce images of higher resolution (e.g., typical CT scans have gone from 128^3 to roughly 512^3 resolutions). With the latest scanning technologies, it is also more common for the values measured at each sample to be multi-dimensional rather than...

### GAUSS Seminar: Mathematics and Redistricting

Tuesday, September 7, 2021 3:30pm to 4:20pm

Schaeffer Hall

What we know, what we don't, and where we're going
Every ten years, the

**Census Bureau**conducts the Census, a nation-wide tallying of every single individual living in the United States.**In addition to helping governments and researchers manage land, understand population trends, and distribute resources**, the Census is essential to a key democratic function:**drawing electoral districts**. The process of drawing electoral districts, called “redistricting,” divides every state in the United States...### AMCS Seminar

Friday, February 19, 2021 3:30pm to 4:20pm

MacLean Hall

**Topic:**Multi-scale methods in quantum field theory

**Speaker:**Wayne Polyzou, Dept. of Physics & Astronomy

### AMCS Seminar

Friday, February 12, 2021 3:30pm to 4:30pm

MacLean Hall

**Topic:**Harmonic analysis, fractals, and applications

**Speaker:**Palle Jorgensen