Title: Hyperfinite equivalence relations in geometric group theory

Abstract: The classification problem (i.e. classifying mathematical objects) is a fundamental question ubiquitous in all areas of mathematics. A naive approach to this problem is to try to find a complete invariant. However, such an invariant is not always accessible in a well described way. Descriptive set theory provides notions and formulations to measure complexities of classification problems even in such cases. I will...

ORCiD (Open Researcher and Contributor ID) is a persistent digital identifier to resolve the researcher's name ambiguity problem. Researchers are required to provide their ORCiD iD when applying for a grant or submitting an article for publication. Learn more about creating an ORCiD iD at www.iam.uiowa.edu/planter, linking your ORCiD iD to the University of Iowa, and adding your publication records from data sources (Scopus, CrossRef, etc.) to your ORCiD. Led by Carol Hollier, sciences reference...

Speaker: Palle Jorgensen, Dept. of Mathematics

Title: Conditional Positive Definiteness and Complete Monotonicity in Subnormal Operator Theory

Join us for an out-of-this-world movie experience as we screen "The Martian" (2015) and explore the science behind the story. Is surviving on Mars really possible? Could you grow potatoes in Martian soil? How accurate are the physics, engineering, and geology portrayed on screen?

Enjoy expert commentary from NASA-affiliated experts in engineering, physics and astronomy, and geology as they break down what’s fact and what’s fiction in this sci-fi classic. Bring your curiosity, questions, and love...