In this paper, we define EI algebra and EII algebra, which are infinit
e distributive molecular lattices. We also define the AFS.structure, w
hich is a special system of Graver and Watkins (1977). With these clas
sical mathematical objects, we establish a totally new system of fuzzy
sets and systems. We have a new concept of fuzzy sets. It is more acc
eptable to the classical mathematical opinions. We can directly make u
se of many classical mathematical results. The most important is that
the system can be operated by computers. (C) 1998 Elsevier Science B.V
.