Séminaire Lotharingien de Combinatoire, B15o (1986), 4 pp.
[Formerly: Publ. I.R.M.A. Strasbourg, 1987, 340/S-15, p.
85-88.]
Giuseppe Pirillo
Sulle proprietà P e P* nei semi-gruppi
Abstract.
The non-trivial free semigroups and the symmetric group Sn
do not have the property P*, which is weaker than the
property P defined by Restivo and Reutenauer.
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