Vague soft sets and their properties

Soft set theory, proposed by Molodtsov, has been regarded as an effective mathematical tool to deal with uncertainty. However, it is difficult to be used to represent the vagueness of problem parameters. In this paper, we introduce the notion of vague soft set which is an extension to the soft set. The basic properties of vague soft sets are presented and discussed. (C) 2009 Elsevier Ltd. All rights reserved.