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
Stalnaker, Robert
Books on Amazon
Validity I 148
Validity / expressiveness / modal / quantification / Stalnaker: the validity of the generalization schema - unlike the identity scheme - depends on limitations of the expressiveness of the extensional theory. If the language is richer, some new instances will be no theorems.

Sta I
R. Stalnaker
Ways a World may be Oxford New York 2003

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Ed. Martin Schulz, access date 2017-04-28