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My understanding of the use-mention distinction is that the former refers to a disposition (behavior) or proposition (meaning bearer) while the latter is merely a reference (syntactical expression such as a string). In this way, dispositions correspond to correspondent truths (combining two individual cookies in results in a state of affairs that a box has a ...


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1+1=2 is a formula (an expression of mathematical language that express a statement) and "1+1=2" is the way to refer to the expression: correct. 1+1 is a term, i.e. an expression that denotes a number. Thus, it is not a formula. The principle of the Indiscernibility of Identicals (the converse of the Identity of Indiscernibles) in its predicate logic ...


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We have a very brief introduction How does Frege's definition of number solve the Julius Caesar problem? here on SE. Zalta's review of it for SEP is a good place to start more scholarly research. Dummett's book Frege: Philosophy of Mathematics is a comprehensive classical commentary. In 2005 Dialectica devoted a whole issue to the Julius Caesar problem, with ...


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