Retracts of free monoids are nowhere dense with respect to finite group topologies and p-adic topologies.
Head, T. ; Forys, W.
Semigroup forum, Tome 43 (1991), p. 117-120 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1991-01-01
EUDML-ID : urn:eudml:doc:135070 
@article{GDZPPN001260839,
     title = {Retracts of free monoids are nowhere dense with respect to finite group topologies and p-adic topologies.},
     journal = {Semigroup forum},
     volume = {43},
     year = {1991},
     pages = {117-120},
     zbl = {0721.68035},
     url = {http://dml.mathdoc.fr/item/GDZPPN001260839}
}

Head, T.; Forys, W. Retracts of free monoids are nowhere dense with respect to finite group topologies and p-adic topologies.. Semigroup forum, Tome 43 (1991) pp. 117-120. http://gdmltest.u-ga.fr/item/GDZPPN001260839/