How lower approximation and discernibility matrix are computed in fuzzy model of Rough set?

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James F Peters

This is a very good question.

For an overview of research on rough sets that includes questions, research projects and publications that include a fuzzy approach, see

https://www.researchgate.net/topic/Rough-Set-Theory

Arnab Sadhu

Thanks, Prof. J F Peters, for the response. Actually, I wanted to know how exactly the lower approximation of similarity, i.e. Sim(R)_(A)(x) is calculated from Sim(R)(xi,xj) in the paper attached.