r.a borzooei - department of mathematics shahid beheshti university tehran
h farahani - department of mathematics shahid beheshti university tehran

in this paper we introduce some types of atanassov's intuitionistic fuzzy filters on BL-algebras and give some of their properties. Finally we introduce the notion of quotient structure related to the atanassov's intuitionistic fuzzy filters, and give some isomorphism theorems.

atanassov's intuitionistic fuzzy filter , BL-algebra,quotient structure