The minimal right $A$-ideal of the free semigroup on a countable set

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The minimal right $A$-ideal of the free semigroup on a countable set. (English). Mathematica Slovaca, vol. 32 (1982), issue 3, pp. 301-304

MSC: 20M05, 20M12 | MR 670007 | Zbl 0493.20045

References:

[1] GROŠEK O., SATKO L.: A new notion in the theory of semigroups. Semigroup Forum 20, 1980, 233-240. MR 0582229

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