I am an assistant professor in the mathematics department at Agnes Scott College in Atlanta, GA.
My research interests are arithmetic dynamics and number theory. I am particularly (but not exclusively) interested in post-critically finite maps, the connections between arithmetic dynamics and arithmetic geometry, and the role of dynamical Belyi maps in arithmetic dynamics.
In 2022-2023 I was a postdoctoral scholar at Oregon State University working with Clay Petsche. From Fall 2019-Spring 2022 I was a post-doctoral fellow at Oklahoma State University working with Paul Fili. I received my PhD from the University of Hawaii in 2019 under Michelle Manes. Since 2021 I have spent my summers working with Thrive Scholars.
You can reach me at btobin at agnesscott.edu
I believe that mathematics should be accessible, inclusive, and fun. I also know that math is difficult. Even if you don’t know the answer today, that doesn’t mean you won’t know it tomorrow. Math can show up in unexpected places, and I want my students to have the confidence to tackle mathematical problems in the real world. I am always happy to chat about how these views influence my courses.
“It’s not a boring place to be, the mathematical world. It’s an extraordinary place; it’s worth spending time there.” -Marcus Du Sautoy
Upcoming events:
- Clayton State University Mathematics Seminar
- AMS Southeastern Sectional (St. Louis University)
- AIM Workshop: Dynamics of Multiple Maps
Recent papers:
Alexander J. Barrios, Manami Roy, Nandita Sahajpal, Darwin Tallana, Bella Tobin, and Hanneke Wiersema, Local data of elliptic curves under quadratic twist, Results in Number Theory 11 (2025)
Angelica Babei, Manami Roy, Holly Swisher, Bella Tobin, and Fang-Ting Tu, Supercongruences arising from Ramanujan-Sato series, Results in Mathematics 80 (2025)
Tori Day, Rebecca DeLand, Jamie Juul, Cigole Thomas, Bianca Thompson, and Bella Tobin, Dynamical irreducibility of certain families of polynomials over finite fields, Finite Fields and their Applications 108 (2025).
Jacqueline Anderson, Emerald Stacy, and Bella Tobin, On a slice of the cubic 2-adic Mandelbrot set, preprint (2024), Available at Arxiv: 2401.09394. To appear in Research Directions in Number Theory, Women in Numbers VI
John Doyle, Paul Fili, Bella Tobin. Stochastic equidistribution and generalized adelic measures. Available on Arxiv: 2111.08905.