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replaced http://front.math.ucdavis.edu/ with https://arxiv.org/abs/

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edited Jun 22, 2022 at 7:16

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This question is studied and partially answered in http://front.math.ucdavis.edu/0904.3153 https://arxiv.org/abs/0904.3153. The answer depends not only on $R$ but also on $n$.

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created Mar 15, 2016 at 14:06

user6976

This question is studied and partially answered in http://front.math.ucdavis.edu/0904.3153. The answer depends not only on $R$ but also on $n$.