Migrative uninorms and nullnorms over t-norms and t-conorms

In this paper the notions of α-migrative uninorms and nullnorms over a fixed t-norm T and over a fixed t-conorm S are introduced and studied. All cases when the uninorm U lies in any one of the most usual classes of uninorms are analyzed, characterizing all solutions of the migrativity equation for all possible combinations of U and T and for all possible combinations of U and S. A similar study is done for nullnorms.