This paper concerns the empirical constraints on a characterization of logical relations in a natural language. Syntactic characterizations are distinguished from model-theoretic ones. It is shown that the structure of syntactic characterizations is largely underdetermined by the empirical constraints that naturally suggest themselves. However, an explanation of the notion of a logical constant is suggested that renders the model-theoretic characterization of logical relations in an extensional language determinate, relative to an idealized intentional psychology for its speakers.
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