Opuscula Math. 28, no. 2 (2008), 123-127

 
Opuscula Mathematica

On a complete lattice of retracts of a free monoid generated by three elements

Wit Foryś

Abstract. We prove that the family of retracts of a free monoid generated by three elements, partially ordered with respect to the inclusion, is a complete lattice.

Keywords: free monoid, retract, lattice, complete lattice.

Mathematics Subject Classification: 68Q05.

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Wit Foryś, On a complete lattice of retracts of a free monoid generated by three elements, Opuscula Math. 28, no. 2 (2008), 123-127

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