Mathematical Sciences Classification System
16Dxx - Modules, bimodules and ideals
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                            16D10General module theory
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                            16D20Bimodules
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                            16D25Ideals
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                            16D30Infinite-dimensional simple rings (except as in 16Kxx)
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                            16D40Free, projective, and flat modules and ideals [See also 19A13]
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                            16D50Injective modules, self-injective rings [See also 16L60]
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                            16D60Simple and semisimple modules, primitive rings and ideals
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                            16D70Structure and classification (except as in 16Gxx), direct sum decomposition, cancellation
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                            16D80Other classes of modules and ideals [See also 16G50]
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                            16D90
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                            16D99None of the above, but in this section