Ideas from 'Barcan Formulae' by Koen Vervloesem [2010], by Theme Structure
[found in 'Key Terms in Logic' (ed/tr Williamson,J/Russo,F) [Continuum 2010,978-1-8470-6114-0]].
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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Barcan:nothing comes into existence; Converse:nothing goes out; Both:domain is unchanging
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