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On Sense and Reference
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On Sense and Reference examines how expressions can share a reference yet differ in cognitive significance. Belief reports make the limits of substitution especially clear.
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Guided course · Module 11 · Lesson 62
Logic, meaning and a new ideal of clarity
Frege distinguishes an expression’s sense from its reference to explain how an identity can be informative. The lesson also shows why substituting one name for another can change what a belief report says.