Visibility and Focus: An Extended Framework for Granular Reasoning
Yasuo Kudo, T. Murai · 2005
In this paper, we introduce another concept of granular reasoning, called visibility. Visibility separates all sentences into “visible” sentences, that is, sentences we consider, and “nvisible” sentences which are out of consideration. Combining visibility and focus, we connects granular reasoning and four-valued truth valuations. We also discuss relationship among granularity based on the visibility and focus, nonmonotonic reasoning by Ziarko's variable precision rough set models, and knowledge base revision.