A note on soft sets, rough soft sets and fuzzy soft sets

Concept of an approximation space associated with each parameter in a soft set is discussed and an approximation space associated with the soft set is defined. For any subset X of the universe U, there is a fuzzy subset of U associated with each parameter of the soft set, also there is a fuzzy subset associated with the soft set. Furthermore each soft set over a set U, gives rise to a fuzzy soft set over P( U) and induces a soft equivalence relation over P(U). (C) 2011 Elsevier B.V. All rights reserved.