Direct sums of injective semimodules and direct products of projective semimodules over semirings
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Tài liệu tham khảo
J. S. Golan, Semirings and Their Applications (Kluwer Academic Publishers, Dordrecht-Boston-London, 1999).
C. Faith, Algebra: Rings, Modules, and Categories (Springer, Berlin-Heidelberg-New York, 1976; Mir, Moscow, 1979), Vol. 2.
L. A. Skornyakov, Elements of General Algebra (Nauka, Moscow, 1983) [in Russian].
S. N. Il’in, “Semirings Over Which All Semimodules Are Injective (Projective),” Matem. Vestn. Pedvuzov i Univ. Volgo-Vyatsk. Regiona, No. 8, 50–53 (2006).