In May to August, 2024, Itamar Mor, Vignesh Subramanian, and I organized a reading seminar on the rational homotopy groups of the K(n)-local spheres at the Max Planck Institute for Mathematics. Here are the seminar website and the notes.
AMS Special Session on Chromatic Homotopy Theory, at the 2025 Fall Sectional Meeting at the University of Denver, Colorado, August, 2025
International Workshop on Algebraic Topology 2025, Hangzhou, China, July 2025.
Northwestern University Topology Seminar, May 2025.
UC San Diego Topology Seminar, March 2025.
MPIM Topology Seminar, August 2024.
Young Topologists Meeting, Münster, Germany. August 2024. Contributed Talk. (Slides)
Chinese Academy of Sciences Hua Luogeng Young Researcher Forum, May 2024 (Slides)
University of Bonn Topology Seminar, May 2024.
University of Pennsylvania Geometry-Topology Seminar, March 2024.
MPIM Topology Seminar, February 2024.
Peking University Geometry and Topology Seminar, December 2023.
Chinese Academy of Sciences Topology Seminar, December 2023.
Joint IU/PU/IUPUI Topology Seminar, Indianapolis, Indiana, December 2023.
Indiana University Bloomington Algebra Seminar, December 2023.
Midwest Topology Seminar, Urbana, Illinois, September 2023. Contributed talk.
Indiana University Bloomington Topology Seminar, September 2023.
Westlake University Math Colloquium, July 2023.
Johns Hopkins University Topology Seminar, April 2023.
MIT Topology Seminar, April 2023.
University of Maryland Algebra-Number Theory Seminar, March 2023.
Texas A&M University Topology Seminar, February 2023.
AMS Special Session on Homotopy Theory: Connections and Applications, at The Joint Mathematics Meetings, Boston, Massachusetts, January 2023.
Arithmetic and Topology, Southern University of Science and Technology, Shenzhen, China, December 2022.
University of Minnesota Topology Seminar, November 2022. (Slides, Video)
University of Pennsylvania Geometry-Topology Seminar, November 2022.
University of Virginia Topology Seminar, October 2022.
Columbia University Algebraic Topology Seminar, September 2022.
Mid-South Algebraic Topology and Geometry Workshop, July 2022. (Video)
UC San Diego Topology Seminar, May 2022.
Temple University Algebra Seminar, November 2021.
The electronic Computational Homotopy Theory (eCHT) Research Seminar, October 2021. (Slides, Video)
UIUC Topology Seminar, April 2021.
Johns Hopkins University Topology Seminar, September 2020. (Slides)
University of Rochester Topology Seminar, September 2020.
University of Pennsylvania Geometry-Topology Seminar, September 2020.
AMS Special Session on Geometric Representation Theory and Equivariant Elliptic Cohomology, at The Joint Mathematics Meetings, Denver, Colorado, January 2020. (Slides)
University of Chicago Topology Seminar, October 2019.
Northwestern University Topology Seminar, October 2019.
University of Notre Dame Topology Seminar, September 2019.
UIUC Topology Seminar, September 2019.
International Workshop on Algebraic Topology 2019, Shanghai, China, August 2019. 20-minute contributed talk. (Slides)
Elliptic Cohomology Days, Urbana, Illinois, June 2019. 10-minute contributed talk.
IWoAT Summer School 2023: Operads, spectra, and multiplicative structures, Yanqi Lake Beijing Institute of Mathematical Sciences and Applications, Beijing, China, August 2023. Two lectures:
Summer School on Chromatic Homotopy Theory and Higher (Infinity-Categorical) Algebra, Shanghai Center for Mathematical Sciences & School of Mathematical Sciences, Fudan University and Yanqi Lake Beijing Institute of Mathematical Sciences and Applications, August 2022. Two lectures:
Summer School on Equivariant Homotopy Theory, Shanghai, China, July 2021.
Equivariant K-theory (Notes, Part 1 Video, Part 2 Video). This talk is different from the 2019 version -- the second part covers KR computations.
Summer School on Equivariant Homotopy Theory, Shanghai, China, August 2019. Two lectures:
Arizona Winter School: Topology and Arithmetic, Tucson, Arizona, March 2019.
Project reports: The Picard group at height 2 (joint with Micah Darrell).
West Coast Algebraic Topology Summer School, Eugene, Oregon, August 2016.
Formal group laws I (jointly prepared with Dileep Menon). (Notes)
Graduate Homotopy Theory Seminar, February 2020.
Exotic elements in Picard groups (Notes and Slides for HFPSS at height 1 and prime 2)
Graduate Homotopy Theory Seminar, December 2019.
The Gross-Hopkins duality (Notes)
AWM Graduate Student Colloquium, November 2019.
Framed cobordism and the J-homomorphism (Slides)
Graduate Algebraic Geometry Seminar, February 2019.
Dieudonné crystals associated to formal groups (Notes)
Graduate Geometry and Topology Seminar, February 2019.
27 lines on smooth cubic surfaces (Notes)
Graduate Algebraic Geometry Seminar, October 2018.
Congruences of modular forms from an algebro-geometric perspective
Graduate Geometry Learning Seminar, October 2018.
Clifford algebras and K-theory (Notes)
Graduate Homotopy Theory Seminar, October 2018.
Congruence and group cohomology
Graduate Number Theory Seminar, February 2018.
Modular forms and moduli of elliptic curves (Notes)
Graduate Homotopy Theory Seminar, September 2017.
What is tmf (Notes)
Graduate Homotopy Theory Seminar, March 2017.
The Brown-Peterson homology theory (Notes)
Graduate Homotopy Theory Seminar, March 2017.
Complex cobordism and formal group laws (Notes)
Graduate Geometry and Topology Seminar, November 2016.
A primary obstruction to an ideal hairy ball (Notes)