## EVENT DETAILS AND ABSTRACT

**Number Theory**
**Title:** Algebraic solutions of differential equations over the projective line minus three points

**Speaker:** Yunqing Tang

**Speaker Info:** Harvard University

**Brief Description:**

**Special Note**:

**Abstract:**

The Grothendieck–Katz p-curvature conjecture predicts that an arithmetic differential equation whose reduction modulo p has vanishing p-curvatures for almost all p, has finite monodromy. It is known that it suffices to prove the conjecture for differential equations on the projective line minus three points. In this talk, I will first focus on this case and introduce a p-adic convergence condition, which would hold if the p-curvature is defined and vanishes. Using the algebraicity criteria established by Andr\'e, Bost, and Chambert-Loir, I will prove a variant of this conjecture for the projective line minus three points, which asserts that if the equation satisfies the above convergence condition for all p, then its monodromy is trivial. I will also prove a similar variant of the p-curvature conjecture for an elliptic curve with j-invariant 1728 minus its identity point.

**Date:** Monday, September 28, 2015

**Time:** 4:00PM

**Where:** Lunt 107

**Contact Person:** Yifeng LIu

**Contact email:** liuyf@math.northwestern.edu

**Contact Phone:**

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