Some Closed Classes of Three-Valued Logic Generated by Periodic   Symmetric Functions
  Closed classes of three-valued logic generated by periodic symmetric funtions that equal $1$ in tuples from $\{1,2\}^n$ and equal $0$ on the rest tuples are considered. Criteria for bases existence and finite bases existence for these classes is obtained. 
Anna Mikhailovich
cs.LO math.LO