The multi-fuzzy soft set and its application in decision making

Molodtsov's soft set theory was originally proposed as a general mathematical tool for dealing with uncertainty. By combining the multi-fuzzy set and soft set models, the purpose of this paper is to introduce the concept of multi-fuzzy soft sets. Some operations on a multi-fuzzy soft set are defined, such as complement operation, AND and OR operations, Union and Intersection operations. Then, the DeMorgan's laws are proved. Finally, by means of level soft set, an algorithm is presented, and a decision problem is analyzed using multi-fuzzy soft set. (C) 2012 Elsevier Inc. All rights reserved.