Abstract
In order to study the communication between information systems, Gong and Xiao (2010, International journal of general systems, 39, 189–206) proposed the concept of general relation mappings based on including degrees. Some properties and the extension for fuzzy information systems of the general relation mappings have been investigated there. In this paper, we point out by counterexamples that several assertions (Lemmas 3.1 and 3.2, Theorems 4.1 and 4.3) in the aforementioned work are not true in general.
Acknowledgement
This work was supported by the National Natural Science Foundation of China under grants 60821001, 60873191, 60903152, and 61070251.