## Philosophy Lexicon of Arguments | |||

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General validity: within a calculus a formula that is satisfied by any interpretation (variable assignment with expressions for objects) is valid. See also satisfaction, satisfiability, interpretation._____________ Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments. | |||

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Books on Amazon |
HC I 65ff Validity/Hughes/Cresswell: No structural property of formulas, no relation between formulas. - In contrast: derivability relation between formulas. - Yet the set of the derived and the valid formulas in a system are identical. HC I 119 Validity/propositional calculus: truth tables are not sufficient for an evaluation of formulas in the propositional calculus. - Because we can not assign truth values to individual variables and predicate variables. _____________ Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. |
Cr I M. J. Cresswell Semantical Essays (Possible worlds and their rivals) Dordrecht Boston 1988 Cr II M. J. Cresswell Structured Meanings Cambridge Mass. 1984 |

> Counter arguments against **Cresswell**

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Ed. Martin Schulz, access date 2018-01-24