Title of article :
The ϑ-lower and T-upper fuzzy rough approximation operators on a semigroup
Author/Authors :
Fei Li، نويسنده , , Yunqiang Yin، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Abstract :
In this paper, we consider a semigroup as a universal set and investigate the properties of ϑ-lower and T-upper fuzzy rough approximation operators. A new fuzzy algebraic structure, called a TL-fuzzy rough semigroup, is introduced and some related properties are studied. Finally, the homomorphism properties of ϑ-lower and T-upper fuzzy rough approximation operators are investigated.
Keywords :
?-lower fuzzy rough approximation operator , TL-fuzzy semigroup , (? , T-upper fuzzy rough approximation operator , T)-fuzzy rough semigroup , L-fuzzy relation , T-congruence L-fuzzy relation
Journal title :
Information Sciences
Journal title :
Information Sciences
