  Let $K$ be a field of characteristic $p > 0$ and let $G$ be a subgroup of
$K^\ast \times K^\ast$ with $\text{dim}_\mathbb{Q}(G \otimes_\mathbb{Z}
\mathbb{Q}) = r$ finite. Then Voloch proved that the equation $ax + by = 1
\text{ in } (x, y) \in G$ for given $a, b \in K^\ast$ has at most $p^r(p^r + p
- 2)/(p - 1)$ solutions $(x, y) \in G$, unless $(a, b)^n \in G$ for some $n
\geq 1$.
  Voloch also conjectured that this upper bound can be replaced by one
depending only on $r$. Our main theorem answers this conjecture positively. We
prove that there are at most $31 \cdot 19^{r + 1}$ solutions $(x, y)$ unless
$(a, b)^n \in G$ for some $n \geq 1$ with $(n, p) = 1$.
  During the proof of our main theorem we generalize the work of Beukers and
Schlickewei to positive characteristic, which heavily relies on diophantine
approximation methods. This is a surprising feat on its own, since usually
these methods can not be transferred to positive characteristic.
