Abstract
In this expository paper, we survey results on the concept of a hull of a ring or a module with respect to a specific class of rings or modules. A hull is a ring or a module which is minimal among essential overrings or essential overmodules from a specific class of rings or modules, respectively. We begin with a brief history highlighting various types of hulls of rings and modules. The general theory of hulls is developed through the investigation of four problems with respect to various classes of rings including the (quasi-) Baer and (FI-) extending classes. In the final section, application to C *-algebras are provided.
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Birkenmeier, G.F., Park, J.K., Rizvi, S.T., Birkenmeier, G.F. (2010). A Theory of Hulls for Rings and Modules. In: Albu, T., Birkenmeier, G.F., Erdoğgan, A., Tercan, A. (eds) Ring and Module Theory. Trends in Mathematics. Springer, Basel. https://doi.org/10.1007/978-3-0346-0007-1_2
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DOI: https://doi.org/10.1007/978-3-0346-0007-1_2
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