Hello!

I’m Gahl, a second year math PhD student at the University of Michigan. I earned a math B.S. from UCSB in the College of Creative Studies. I’m interested in the cohomology of arithmetic groups, and generally excited to learn more about group (co)homology and combinatorial topology/commutative algebra. My advisor is Jenny Wilson.

I’m very grateful to be supported by an NSF Graduate Research Fellowship and a Rackham Merit Fellowship (Rackham Science Award).

Beyond learning and doing math, I enjoy teaching math, playing soccer, reading, lifting, skiing, hiking, thrifting, and speaking Hebrew & French.

Do not hesitate to reach out!

Teaching

• UM Math 115 (Calc I) (Fall 2023, Winter 2024)
• UM Math 116 (Calc II) (Winter 2025)

Activities

I am on the executive board of Michigan’s Association for Women in Math, serve as a mentor for Michigan’s Directed Reading Program in Mathematics, and volunteer at Super Saturdays!

Sadie Lipman and I are organizing the 2025 Michigan summer minicourses.

Expository

• An intro to vanishing theorems in local cohomology, written as a final project for UM Math 614 (Commutative Algebra), Fall 2023.

Papers

• Topology of augmented bergman complexes with E. Bullock, A. Kelley, V. Reiner, K. Ren, D. Shen, B. Sun, A. Tao, and Z. Zhang (Electronic Journal of Combinatorics).
• On the Cauchy transform of the complex power function with B. Faktor and M. Kuhn (Ball State Mathematics Exchange).

Other

• Modular principal series representation of GL2 over finite rings.
• Lattice models and puzzles for Dual Weak symmetric Grothendieck Polynomials with E. Bullock, N. Caplinger, A. Chin, N. Davis, and C. Frechette.

Talks

• UM Student Commutative Algebra: Progress in Big & Small Cohen-Macaulay Modules (Mar 2024)
• UM Student Commutative Algebra: Introduction to Group Cohomology (Oct 2024)
• UM Student Dynamics/ Geometry/ Topology: Poincaré Duality Groups (Nov 2024)
• UM Student Commutative Algebra: Cohen-Macaulay Simplicial Complexes (Apr 2025)