Geodesic
Commutative zeropotent semigroups with few prime ideals
Commentationes Mathematicae Universitatis Carolinae, Tome 52 (2011) no. 4, pp. 501-505.

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We construct an infinite commutative zeropotent semigroup with only two prime ideals.
Classification : 20M14
Keywords: semigroup; zeropotent; prime ideal 
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     title = {Commutative zeropotent semigroups with few prime ideals},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {501--505},
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Ježek, J.; Kepka, T.; Němec, P. Commutative zeropotent semigroups with few prime ideals. Commentationes Mathematicae Universitatis Carolinae, Tome 52 (2011) no. 4, pp. 501-505. http://geodesic.mathdoc.fr/item/CMUC_2011__52_4_a2/