My name is Florian Sprung. Many people also call me Ian. My work is in arithmetic geometry and number theory.

I am a tenure-track assistant professor at Arizona State University. My Erdős number is three.

You can reach me at ian.sprung (at)

Here is my teaching page.


  • Chromatic Selmer groups for imaginary quadratic fields


with Cédric Dion, published in Abhandlungen aus dem mathematischen Seminar Hamburg

with Antonio Lei, published in Israel Journal of Mathematics

(Video available here.)

with Francesc Castella, Mirela Ciperiani, and Chris Skinner


published in RIMS Bessatsu

with Ken Ono and Larry Rolen, published in Advances in Mathematics

published in Research in Number Theory

published in Algebra and Number Theory

published in Journal für die reine und angewandte Mathematik (Crelle's Journal)

published in RIMS Bessatsu

published in the Journal of Number Theory

(The video features Shinichi Kobayashi and Robert Pollack)

published in the Proceedings of the 6th Kinosaki Shinjin Seminar

Before getting into academia, I worked at the Kirakuen retirement home.

Here is an essay by Kodaira on how to read.