Orthopairs in the 1960s: Historical Remarks and New Ideas
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TL;DR
Before the advent of fuzzy and rough sets, some authors in the 1960s studied three-valued logics and pairs of sets with a meaning similar to those the authors can encounter nowadays in modern theories such as rough Set Theory, decision theory and granular computing.
Abstract
Before the advent of fuzzy and rough sets, some authors in the 1960s studied three-valued logics and pairs of sets with a meaning similar to those we can encounter nowadays in modern theories such as rough sets, decision theory and granular computing. We revise these studies using the modern terminology and making reference to the present literature. Finally, we put forward some future directions of investigation
