16XX 


Associative rings and algebras {For the commutative case, see 13XX} 

16Dxx 

Modules, bimodules and ideals 


16D10 
General module theory 


16D20 
Bimodules 


16D25 
Ideals 


16D30 
Infinitedimensional simple rings (except as in 16Kxx) 


16D40 
Free, projective, and flat modules and ideals [See also 19A13] 


16D50 
Injective modules, selfinjective rings [See also 16L60] 


16D60 
Simple and semisimple modules, primitive rings and ideals 


16D70 
Structure and classification (except as in 16Gxx), direct sum decomposition, cancellation 


16D80 
Other classes of modules and ideals [See also 16G50] 


16D90 
Module categories [See also 16Gxx, 16S90]; module theory in a categorytheoretic context; Morita equivalence and duality 


16D99 
None of the above, but in this section 