Assertions and Hypotheses: A Logical Framework for their Opposition Relations

Logic Journal of the IGPL:Doi 10.1093/jigpal/jzw036 (2016)

Authors
Massimiliano Carrara
University of Padua
Daniele Chiffi
Politecnico di Milano
Abstract
Following the speech act theory, we take hypotheses and assertions as linguistic acts with different illocutionary forces. We assume that a hypothesis is justified if there is at least a scintilla of evidence for the truth of its propositional content, while an assertion is justified when there is conclusive evidence that its propositional content is true. Here we extend the logical treatment for assertions given by Dalla Pozza and Garola (1995, Erkenntnis, 43, 81–109) by outlining a pragmatic logic for assertions and hypotheses. On the basis of this extension we analyse the standard logical opposition relations for assertions and hypotheses. We formulate a pragmatic square of oppositions for assertions and a hexagon of oppositions for hypotheses. Finally, we give a mixed hexagon of oppositions to point out the opposition relations for assertions and hypotheses
Keywords logic for pragmatics  assertion  hypothesis
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