Abstract
The note concerns two-universe rough sets. First, we discuss the name of two-universe model. Second, we outline two lines of the development of two-universe rough sets and affirm that three-way decision unifies models of two-universe rough sets.




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In [19], it exactly cited [31, 32] and Yao et al., 1995 as the references of two-universe rough sets. Unfortunately, the list of references missed the paper Yao et al., 1995, which obviously was [42]. Besides, [36] said the first study on the rough set model over two universes was done in 1995, but no references were presented. I think that it means [32], or [42], or both of them.
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This work is supported by the National Natural Science Foundation of China (Nos. 61772019, 61976244, 61906154).
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Li, X., Yan, Y. Three-way decision: a unification of two-universe models of rough sets. Appl Intell 54, 460–469 (2024). https://doi.org/10.1007/s10489-023-05209-9
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DOI: https://doi.org/10.1007/s10489-023-05209-9