## Philosophy Lexicon of Arguments | |||

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. | |||

Author | Item | Excerpt | Meta data |
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Books on Amazon |
HC I 65 ~ 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 p.c. - because we can not assign truth values to individual variables and predicate variables. |
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 2017-05-25