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机译:
Masaryk Univ, Fac Sci, Dept Math & Stat, Kotlarska 2, Brno 61137, Czech Republic;
Johannes Kepler Univ Linz, Symbol Computat Res Inst, Altenbergerstr 69, A-4040 Linz, Austria;
Commutative semiring; divisible semigroup; idempotent; numerical semigroup; embedding;