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Original Articles

The poset of retracts of a free monoid

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Pages 45-48 | Received 29 May 1990, Published online: 19 Mar 2007

References

  • Blattner , M. and Head , T. 1977 . Automata that recognize intersections of free monoids . Information and Control , 35 : 173 – 176 .
  • Engelfriet , J. and Rozenberg , G. 1979 . Equality languages and fixed point languages . Information and Control , 43 : 20 – 49 .
  • Foryś , W. 1990 . On the family of retracts of free monoids . Intern. J. Computer Math , 33 : 31 – 36 .
  • Foryś W. Head T. Retracts of free monoids are no where dense with respect to finite group topologies and padic topologies Semigroup Forum to appear
  • Head , T. 1982 . Expanded subalphabets in the theories of languages and semigroups . Intern. J. Comput. Math , 12 : 113 – 123 .
  • Lallement , G. 1979 . Semigroups and Combinatorial Applications , New York : John Wiley and Sons .
  • Tilson , B. 1972 . The intersection of free submonoids of a free monoid is free . Semigroup Forum , 4 : 345 – 350 .

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