IN ref. [1], Ponizovskiǐ raised the following problem: which semigroup rings are rings with identity? In ref. [2], Li investigated orthodox semigroup rings. In this letter we discuss periodic semigroup rings. Using t...IN ref. [1], Ponizovskiǐ raised the following problem: which semigroup rings are rings with identity? In ref. [2], Li investigated orthodox semigroup rings. In this letter we discuss periodic semigroup rings. Using the same notation as in ref. [2], we展开更多
文摘IN ref. [1], Ponizovskiǐ raised the following problem: which semigroup rings are rings with identity? In ref. [2], Li investigated orthodox semigroup rings. In this letter we discuss periodic semigroup rings. Using the same notation as in ref. [2], we
