Mathematics – Number Theory
Scientific paper
2009-10-16
Mathematics
Number Theory
8 pages. (v4: added Thm 2; v3: added conjectural class number formula; v2: minor corrections)
Scientific paper
10.1007/s00208-010-0506-6
We show that the module of integral points on a Drinfeld module satisfies a an analogue of Dirichlet's unit theorem, despite its failure to be finitely generated. As a consequence, we obtain a construction of a canonical finitely generated sub-module of the module of integral points. We use the results to give a precise formulation of a conjectural analogue of the class number formula.
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