Soft set theory is a new mathematical tool to deal with uncertain information. This paper studies soft coverings and their parameter reductions. Firstly, we define a soft set on the power set of an initial universe and discuss its properties. Secondly, we introduce soft coverings and obtain the lattice structure of soft sets induced by them. Thirdly, we investigate parameter reductions of a soft covering by means of attribute reductions in a covering information system and present their algorithm. Finally, we give an application to show the usefulness of parameter reductions of a soft covering. 
Soft coverings and their parameter reductions