Explicit invariants of the Suzuki and Ree groups in their function fields

RESUMO

The Suzuki and Ree curves are two classical Deligne--Lusztig curves. They are maximal over suitable finite fields and their full automorphism groups are the Suzuki and Ree groups. In this paper we determine explicit generators of the fixed fields of these full automorphism groups in the corresponding function fields. Motivated by Dickson's classical study of invariants of finite linear groups, we use the natural projective representations of the two groups. In the Suzuki case the proof uses restricted Dickson invariants, whereas in the Ree case it relies on an invariant bilinear form of the seven-dimensional representation.