Retracts of free monoids are nowhere dense with respect to finite group topologies and p-adic topologies.
Semigroup forum, Tome 42 (1991) no. 3, pp. 117-120.

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Mots-clés : finite group topology
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     author = {T. Head and W. Forys},
     title = {Retracts of free monoids are nowhere dense with respect to finite group topologies and p-adic topologies.},
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T. Head; W. Forys. Retracts of free monoids are nowhere dense with respect to finite group topologies and p-adic topologies.. Semigroup forum, Tome 42 (1991) no. 3, pp. 117-120. http://geodesic.mathdoc.fr/item/SF_1991__42_3_135070/