Lexicon of Arguments

 Philosophical and Scientific Issues in Dispute
 
[german]


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Theses I
Theses II

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Hughes I 65ff
Validity/Hughes/Cresswell: No structural property of formulas, no relation between formulas. - In contrast: derivability relation between formulas.
>Derivability, >Formulas.
Yet the set of the derived and the valid formulas in a system are identical.
Hughes I 119
Validity/propositional calculus: truth tables are not sufficient for an evaluation of formulas in the propositional calculus.
>Predicate calculus.
Because we can not assign truth values to individual variables and predicate variables.
>Truth values, >Valuation.

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