Automorphisms of Hyperelliptic GAG-codes

In this talk, we discuss the n-automorphism groups of generalizedalgebraic-geometry codes associated with rational, elliptic andhyperelliptic function fields. Such groups are, up to isomorphism, subgroups of the automorphism groups of the underlying function fields. Wealso present some examples in which the n-automorphism groups can be determined explicitly.