Abstract

AbstractRecently, Gustavo Cevolani, Vincenzo Crupi and Roberto Festa have shown that their account of verisimilitude of ‘conjunctive theories’ of a finite propositional language can be nicely linked to a variant of AGM belief set revision, viz. belief base revision, in the sense that the latter kind of revision is functional for truth approximation according to the conjunctive account (Cevolani et al., Erkenntnis 75(2):183–222, 2011). In the present paper I offer a generalization of these ideas to the case of approaching any divide of a (finite or infinite) universe, allowing several interpretations, besides true (false) atomic propositions, notably nomic states (not) in equilibrium, nomic (im)possibilities, (non-)instantiated ‘Q-predicates’ of a monadic language. It shows how and why approximation of ‘the true boundary’ takes place by belief base revision guided by evidence.KeywordsTruth approximationBelief base revisionset-theoryuniverse of discourse

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