Fuzzy bi-ideals in ordered semigroups
Keywords: ایده آل; Fuzzy subsemigroup; Fuzzy bi-ideal in an ordered semigroup; Left (right) ideal; Ideal; Filter; Semiprime elements in ordered semigroups; Congruence; Semilattice congruence; Complete semilattice congruences on an ordered semigroup; Regular; Left (right) si