Séminaire Lotharingien de Combinatoire, B22k (1989), 2 pp.
[Formerly: Publ. I.R.M.A. Strasbourg, 1990, 414/S-22, p.
131-132.]
Giuseppe Pirillo
Permutabilità e proprietà combinatorie
delle parole infinite su un alfabeto finito
Abstract.
We discuss some aspects of the properties P and P*
for semigroups.
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