## Diophantine approximation in function fields

#### Erez Nesharim (University of York)

Irrational rotations of the circle $$T : \mathbb{R}\setminus\mathbb{Z} \to \mathbb{R}\setminus\mathbb{Z}$$ are amongst the most studied dynamical systems. Rotations by badly approximable angels are exactly those for which the orbit of zero do not visit certain shrinking neighborhoods of zero, namely, there exists $$c > 0$$ such that $$T^n(0) \notin B(0,\frac{c}{n})$$ for all $$n \in \mathbb{N}$$.
We will introduce the notion of approximation by rational functions in the field $$\mathbb{F}_q((t^{-1}))$$, formulate the analogue of Khinchine's theorem over function fields and calculate the largest constant in this context.