Columbia subject headings:
Injective modules (Algebra)
Projective modules (Algebra)
Harvard subject headings:
Decomposition (Mathematics)
Injective modules (Algebra)
Modules (Algebra)
Projective modules (Algebra)
Representations of rings (Algebra)
Princeton subject headings:
Decomposition (Mathematics)
Injective modules (Algebra)
Projective modules (Algebra)
Representations of rings (Algebra)