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00925njm 22002777a 4500 dc Gonzalez-Hedstrom, Juan-De-Dios author Minana, Juan-Jose author Valero, Oscar author 2021-06 Indistinguishability fuzzy relations were introduced with the aim of providing a fuzzy notion of equivalence relation. Many works have explored their relation to metrics, since they can be interpreted as a kind of measure of similarity and this is, in fact, a dual notion to dissimilarity. Moreover, the problem of how to construct new indistinguishability fuzzy relations by means of aggregation has been explored in the literature. In this paper, we provide new characterizations of those functions that allow us to merge a collection of indistinguishability fuzzy relations into a new one in terms of triangular triplets and, in addition, we explore the relationship between such functions and those that aggregate extended pseudo-metrics, which are the natural distances associated to indistinguishability fuzzy relations. Our new results extend some already known characterizations which involve only bounded pseudo-metrics. In addition, we provide a completely new description of those indistinguishability fuzzy relations that separate points, and we show that both differ a lot. Gonzalez-Hedstrom JDD, Minana JJ, Valero O. Aggregation of Indistinguishability Fuzzy Relations Revisited. Mathematics. 2021 Jun;9(12):1441. https://hdl.handle.net/20.500.13003/19429 https://hdl.handle.net/20.500.12105/23230 10.3390/math9121441 2227-7390 Mathematics 2-s2.0-85109045681 666234700001 Aggregation Indistinguishability fuzzy relation Extended pseudo-metric Additive generator Continuous Archimedean t-norm Aggregation of Indistinguishability Fuzzy Relations Revisited