Zelmanowitz density theorem for rings graded by semigroup
S. V. Zelenov
M. V. Lomonosov Moscow State University
Rings graded by semigroup and modules graded by polygon over semigroup are considered in the paper. Notions of graded critically compressible module and quasi-injective hull are introduced. The structure of the corresponding objects is studied. The density theorem for graded weakly primitive ring is proved.
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S. V. Zelenov, “Zelmanowitz density theorem for rings graded by semigroup”, Fundam. Prikl. Mat., 7:2 (2001), 373–385
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\paper Zelmanowitz density theorem for rings graded by semigroup
\jour Fundam. Prikl. Mat.
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