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The rst part of this paper classies all purely cubic function elds over a nite eld of characteristic not equal to 3. In the remainder, we describe a method for computing the fundamental unit and regulator of a purely cubic congruence function eld of unit rank 1 and characteristic at least 5. The technique is based on Voronoi's algorithm for generating a chain of successive minima in a multiplicative cubic lattice, which is used for calculating the fundamental unit and regulator of a purely cubic number eld.

Voronoi's algorithm in purely cubic congruence function fields of unit rank 1