On ignorance and contradiction considered as truth-values

Logic Journal of the IGPL 16 (1):195--216 (2008)
A critical view of the alleged significance of Belnap four-valued logic for reasoning under inconsistent and incomplete information is provided. The difficulty lies in the confusion between truth-values and information states, when reasoning about Boolean propositions. So our critique is along the lines of previous debates on the relevance of many-valued logics and especially of the extension of the Boolean truth-tables to more than two values as a tool for reasoning about uncertainty. The critique also questions the significance of partial logic
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DOI 10.1093/jigpal/jzn003
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