
University of SydneySchool of Mathematics and StatisticsComputational Arithmetic Geometry Seminar10:05  10.55 (+ epilogue until 11.30) in Carslaw 709 on Friday 28 February
Claus FiekerComputing abelian extensions of global function fieldsQuite a few of the known best codes come from global function fields or more presicely from function fields with many rational places in comparison with their genus. Most of the (theoretic) constructions for those fields are based on class field theory using either classical CFT (Ray class groups) or more modern approaches via Drinfeld modules. In this talk I will demonstrate how the classcial approach can be used to compute defining equations for abelian extensions. The techniques are based on Kummer and ArtinSchreierWitt theory, and follow the classical existence proofs. 