Geodesic
No semigroup is a finite union of mutants.
Semigroup forum, Tome 6 (1974), pp. 360-361.

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     author = {J.B. Kirn},
     title = {No semigroup is a finite union of mutants.},
     journal = {Semigroup forum},
     pages = {360--361},
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     volume = {6},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133995/}
}
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J.B. Kirn. No semigroup is a finite union of mutants.. Semigroup forum, Tome 6 (1974), pp. 360-361. http://geodesic.mathdoc.fr/item/SF_1974__6_133995/