Abstract
An argument is valid if its conclusion follows from its premises; it is invalid if it is possible for its premises to be true while its conclusion is false. How can we be certain of these claims?
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Read, S. (2001). Self-Reference and Validity Revisited. In: Yrjönsuuri, M. (eds) Medieval Formal Logic. The New Synthese Historical Library, vol 49. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9713-5_7
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