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A Tensor's Torsion

Neil Steinburg, University of Nebraska - Lincoln


While tensor products are quite prolific in commutative algebra, even some of their most basic properties remain relatively unknown. We explore one of these properties, namely a tensor's torsion. In particular, given any finitely generated modules, M and N over a ring R, the tensor product M⊗ R N almost always has nonzero torsion unless one of the modules M or N is free. Specifically, we look at which rings guarantee nonzero torsion in tensor products of non-free modules over the ring. We conclude that a specific subclass of one-dimensional Gorenstein rings will have this property.

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Recommended Citation

Steinburg, Neil, "A Tensor's Torsion" (2018). ETD collection for University of Nebraska-Lincoln. AAI10843331.