The index of a group in a semigroup.
Bergman, George M.
Pacific J. Math., Tome 39 (1971) no. 3, p. 55-62 / Harvested from Project Euclid
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Publié le : 1971-05-14
Classification:  20.93 
@article{1102971267,
     author = {Bergman, George M.},
     title = {The index of a group in a semigroup.},
     journal = {Pacific J. Math.},
     volume = {39},
     number = {3},
     year = {1971},
     pages = { 55-62},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1102971267}
}

Bergman, George M. The index of a group in a semigroup.. Pacific J. Math., Tome 39 (1971) no. 3, pp.  55-62. http://gdmltest.u-ga.fr/item/1102971267/