Abstract
We introduce the concept of generalised interval‐valued fuzzy soft set and its operations and study some of their properties. We give applications of this theory in solving a decision making problem. We also introduce a similarity measure of two generalised interval‐valued fuzzy soft sets and discuss its application in a medical diagnosis problem: fuzzy set; soft set; fuzzy soft set; generalised fuzzy soft set; generalised interval‐valued fuzzy soft set; interval‐valued fuzzy set; interval‐valued fuzzy soft set.
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