Abstract and Keywords
The first virtue of the rough characterization of concepts in terms of ways of thinking of objects and properties, and their role in that-clauses, is that it highlights the relation between concepts and reference. The second virtue of the initial characterization is that it establishes the prima facie relevance of what has come to be called Frege's Principle in the individuation of concepts. A third virtue of the initial characterization is that it brings out a phenomenon whose significance is insufficiently appreciated. There is a phenomenon of productivity for thought about mental states that is just as striking as the original phenomenon of the productivity of conceptual thought about the non-mental world.
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