Mathematical Sciences Classification System
13Cxx - Theory of modules and ideals
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13C05Structure, classification theorems
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13C10Projective and free modules and ideals [See also 19A13]
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13C11Injective and flat modules and ideals
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13C12Torsion modules and ideals
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13C13Other special types
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13C14Cohen-Macaulay modules [See also 13H10]
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13C15Dimension theory, depth, related rings (catenary, etc.)
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13C20Class groups [See also 11R29]
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13C40
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13C60Module categories
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13C99None of the above, but in this section