Journal
IEEE TRANSACTIONS ON FUZZY SYSTEMS
Volume 30, Issue 5, Pages 1239-1247Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TFUZZ.2021.3057231
Keywords
n-uninorm; nullnorm; representable uninorm; t-conorm; t-norm; uninorm
Funding
- Grant VEGA [1/0006/19]
- SAS
- [APVV-16-0073]
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This article studies the characterizing functions of n-uninorms with continuous underlying t-norms and t-conorms. These functions can divide the points of discontinuity of n-uninorms and have specific properties.
The characterizing set-valued functions were introduced for uninorms with continuous underlying functions and these set-valued functions were useful for the complete characterization of such uninorms. In this article, we study the characterizing functions of n-uninorms with continuous underlying t-norms and t-conorms. We will show that an n-uninorm with continuous underlying functions possesses n characterizing set-valued functions, where the graphs of these characterizing set-valued functions cover the set of all points of discontinuity of the respective n-uninorm. Moreover, for i = 1, . . . , n, the ith characterizing set-valued function divides the unit square into the two sets, where below the graph of the ith characterizing set-valued function, the n-uninorm attains values smaller than the local neutral element e(i) and above the graph of the ith characterizing set-valued function, the n-uninorm attains values greater than the local neutral element e(i).
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