Notes on: "Interval-valued intuitionistic fuzzy soft sets and their properties" [Comput. Math. Applications 60 (2010) 906-918]

In this paper, we point out two definitions (Definition 18 and Definition 19) in a previous paper by Jiang et al. [Y. Jiang, Y. Tang, Q. Chen, H. Liu, J. Tang, Interval-valued intuitionistic fuzzy soft sets and their properties, Comput. Math. Appl. 60 (2010) 906-918] are not appropriate. Accordingly, the proofs of some relevant theorems are also not right. We redefine the two definitions and reprove these theorems by using the new definitions.