TY - JOUR ID - Foryś2008 LB - Foryś2008 AU - Foryś, Wit TI - On a complete lattice of retracts of a free monoid generated by three elements ST - On a complete lattice of retracts of a free monoid generated by three elements JO - Opuscula Math. JA - Opuscula Math. JF - Opuscula Mathematica PY - 2008 VL - 28 IS - 2 SP - 123 EP - 127 DO - http://dx.doi.org/10.7494/OpMath.2008.28.2.123 UR - http://dx.doi.org/10.7494/OpMath.2008.28.2.123 AB - 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. KW - free monoid KW - retract KW - lattice KW - complete lattice SN - 1232-9274 ER -