Comments on Interval type-2 fuzzy sets are generalization of interval-valued fuzzy sets: towards a wide view on their relationship Mendel, Jerry M. Hagras, Hani Bustince, Humberto Herrera Triguero, Francisco Interval type-2 fuzzy sets Interval-valued fuzzy set Type-2 fuzzy set The authors would like to thank the reviewers of this Letter for their suggestions and interesting questions. This letter makes some observations about "Interval type-2 fuzzy sets are generalization of interval-valued fuzzy sets: Towards a wide view on their relationship,"IEEE Trans. Fuzzy Systems that further support the distinction between an interval type-2 fuzzy set (IT2 FS) and an interval-valued fuzzy set (IV FS), points out that all operations, methods, and systems that have been developed and published about IT2 FSs are, so far, only valid in the special case when IT2 FS = IVFS, and suggests some research opportunities. 2020-12-14T12:41:20Z 2020-12-14T12:41:20Z 2016-02 info:eu-repo/semantics/article J. M. Mendel, H. Hagras, H. Bustince and F. Herrera, "Comments on “Interval Type-2 Fuzzy Sets are Generalization of Interval-Valued Fuzzy Sets: Towards a Wide View on Their Relationship”," in IEEE Transactions on Fuzzy Systems, vol. 24, no. 1, pp. 249-250 [10.1109/TFUZZ.2015.2446508] http://hdl.handle.net/10481/64894 10.1109/TFUZZ.2015.2446508 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess Atribución-NoComercial-SinDerivadas 3.0 España IEEE