Abstract
As a vital tool in data analysis, aggregation functions have been widely studied in many papers. In particular, one of the recent research topics for aggregation functions is the study of the various extension forms of those useful functions. This paper continues to research this topic from the theoretical point of view. First, we introduce the notions of L-fuzzy aggregation functions and general L-fuzzy aggregation functions based on complete residuated lattices. Then we present the upper and lower general L-fuzzy aggregation approximation functions of the general L-fuzzy aggregation functions, which are the pointwise extension of an L-fuzzy aggregation function. Moreover, we consider some vital properties of those aggregation approximation functions and investigate the relationship between those aggregation approximation functions and the corresponding L-fuzzy relations. Finally, we show that the approach of axiomatizations of the upper and lower general L-fuzzy aggregation approximation functions ensures the existence of corresponding L-fuzzy relations which generate the functions.
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Acknowledgements
The authors express their sincere thanks to the editors and anonymous reviewers for their most valuable comments and suggestions for greatly improving this article. Yexing Dan and Bao Qing Hu acknowledge support by grants from the National Natural Science Foundation of China (Grant Nos. 11971365 and 11571010) and the Natural Science Foundation of Hubei Province (Grant No. 2019CFA007). Junsheng Qiao acknowledges support by the National Natural Science Foundation of China (11901465), the Scientific Research Fund for Young Teachers of Northwest Normal University (5007/384) and the Doctoral Research Fund of Northwest Normal University (6014/0002020202).
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Dan, Y., Hu, B.Q. & Qiao, J. General L-fuzzy aggregation functions based on complete residuated lattices. Soft Comput 24, 3087–3112 (2020). https://doi.org/10.1007/s00500-019-04642-8
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DOI: https://doi.org/10.1007/s00500-019-04642-8