In this paper,we introduce concepts of stabiliser subsets of a set and congruent pairs,and generalize and discuss Oehmkes' problems.Specially,we have got relative results of semigroups for Lehmkes' problems.
文摘In this paper,we introduce concepts of stabiliser subsets of a set and congruent pairs,and generalize and discuss Oehmkes' problems.Specially,we have got relative results of semigroups for Lehmkes' problems.