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Non-free iterative differential modules

In the article "Picard-Vessiot theory of differentially simple rings" we established a Picard-Vessiot theory over differentially simple rings which may not be fields. Differential modules over such rings were proven to be locally free but do not have to be free as modules. In this article, we give a family of examples of non-free differential modules, and compute Picard-Vessiot rings as well as Galois groups for them.

preprint2015arXivOpen access
Andreas Maurischat
math.ACmath.RA
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Andreas Maurischat

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