Shaul Ragimov

Math homepage

I am a Ph.D. student in mathematics at the University of Chicago, advised by Prof. Tomer Schlank.

My research lies in homotopy theory and higher category theory. I am particularly interested in chromatic homotopy theory, higher semiadditivity, algebraic K-theory, character theory, higher Galois theory, and power operations. I am also interested in foundations of higher category theory and in connections between homotopy theory and p-adic geometry.

Contact: shaulragimov (at) uchicago.edu

Research

Higher Semiadditive Character Theory submitted

Semiadditive Alternating Powers and Twisted Power Operations joint with Shai Keidar, submitted

Twisted Graded Categories joint with Shai Keidar, to appear in Transactions of the American Mathematical Society

The ∞-Categorical Reflection Theorem and Applications joint with Tomer Schlank, Journal of Topology

Selected Talks

Character Theory for the K(n) local sphere
Notre Dame topology seminar, November 2026, Indiana, USA

Higher Semi-Additive Character Theory
Harvard Thursday Seminar, May 2026, Massachusetts, USA

Semi-Additive Alternating Powers
Revisiting Localizations and Beyond, June 2024, Mainz, Germany

Biquandles are Topological Field Theories
Advances in Homotopy Theory IV, June 2023, held over Zoom
Video

Organization

Geometric Langlands seminar on Weil-Moore anima - Fall Quarter 2026. Co-organized with Leo Gratien

Duality and Linearization for p-Adic Lie groups Seminar - Spring Quarter 2026

Motivic Homotopy Seminar - Fall and Winter Quarter 2025/2026

Modern Algebra Open Research Topic Seminar (Malort) - Academic year 2025/2026

Chicago Chromatic Homotopy Day - February 2025. Co-organized with Shai Keidar, Akhil Mathew and Tomer Schlank

Modern Algebra Open Research Topic Seminar (Malort) - Fall Quarter 2026

Teaching

Fall Quarter 2026 - Mathematical Methods for Economic Analysis, Instructor, The University of Chicago

Spring Quarter 2026 - Calculus III, Instructor, The University of Chicago

Winter Quarter 2026 - Elem Functions and Calculus II, Instructor, The University of Chicago

Fall Quarter 2025 - Elem Functions and Calculus I, Instructor, The University of Chicago

Fall Semester 2024 - Introduction to Complex Analysis, TA, The Hebrew University of Jerusalem

Fall Semester 2023 - Algebraic Structures 1 (Introduction to Group Theory), TA, The Hebrew University of Jerusalem

Fall Semester 2022 - Introduction to Complex Analysis, TA, The Hebrew University of Jerusalem

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