## The $\infty$-categorical point of view for Thom spectra

By Omar Antolín, Universidad Nacional Autónoma de México.
Language: English.

I will describe the $\infty$-categorical approach developed by Ando, Blumberg, Gepner, Hopkins, and Rezk to Thom spectra of stable spherical fibrations. I will also mention joint work with Tobias Barthel that uses this approach to study the multiplicative structure of such spectra. This multiplicative structure is characterized by a universal property, which is more useful than might seem given its simplicity. As an application we will discuss $E_{n}$-orientations and the Thom isomorphism.

I won’t assume familiarity with either $\infty$-categories or with $E_n$-ring spectra; on the contrary, I hope this mini course will serve as an introduction to these topics.

## Foundations of homological algebra applied to modules

By Sean Sather-Wagstaff, Clemson University.
Language: English.

Each module $M$ over a commutative local Noetherian ring $R$ comes equipped with certain numerical invariants, defined homologically, that allow us to detect certain structural information about the module. For example, the projective dimension detects how close $M$ is to being projective. Not only that, but projective dimension of modules can detect whether a ring is regular, as Auslander, Buchsbaum, and Serre proved in the 1950s, and this led to the solution of a famous open question about the localization properties for regular rings. In this course, I will discuss some of these ideas (there are many out there) focusing on a few favorites, including foundational topics.

Bibliography: Abstract Algebra, 3ed; Dummit and Foote (sections 7.1-9.5, 10.1-11.4,12.1, 13.1-13.2, and pp. 656-657, 706-709, 714-715, 718-719. Algebra; Hungerford, Algebra (Chapters 1-2 and sections V.1, VII.1, VIII.1, and Theorem VIII.4.9). Introduction to Commutative Algebra; Atiyah and MacDonald (Chapters 1-3 and 6).

## Algebraic $K$-Theory and connections to Topology

By Mohamed Elhamdadi, University of South Florida.
Language: English.

We will give a foundational course on algebraic $K$-Theory. We will introduce the $K$-groups starting from the Grothendieck group $K_{0}$ to higher $K$-groups including the Plus-construction of Quillen. Connections to Hochschild and cyclic homology will be given. If time allows we will discuss a variation of $K$-theory called Karoubi’s $K$-theory.

Biblography: The K-book. An introduction to algebraic K-theory; Weibel, Charles. Cyclic homology; Loday, Jean-Louis. Algebraic K-theory and its applications; Rosenberg, Jonathan. Approach to algebraic K-theory. Research Notes in Mathematics, 56; Berrick, A. Jon.