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Keywords:
CF-couple; CF-module; commutative ring; local ring
CF-couple; CF-module; commutative ring; local ring
Summary:
Let $R$ be a commutative ring with unit. We give some criterions for determining when a direct sum of two CF-modules over $R$ is a CF-module. When $R$ is local, we characterize the CF-modules over $R$ whose tensor product is a CF-module.
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