<documents_info>On Sense and Reference" by Gottlob Frege,On Denoting" by Bertrand Russell,Naming and Necessity" by Saul Kripke,A Theory of Descriptions" by Bertrand Russell,The Problem of the Essential Indexical" by John Perry,The Nature of Truth" by Michael Dummett</documents_info>
<query>What is the significance of the distinction between sense and reference in Frege's philosophy of language?</query>
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<documents_info>On Sense and Reference" by Gottlob Frege,On Denoting" by Bertrand Russell,Naming and Necessity" by Saul Kripke,A Theory of Descriptions" by Bertrand Russell,The Problem of the Essential Indexical" by John Perry,The Nature of Truth" by Michael Dummett</documents_info>
<query>What is the significance of the distinction between sense and reference in Frege's philosophy of language?</query>
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<query>What is the significance of the distinction between sense and reference in Frege's philosophy of language?</query>
<documents_info>On Sense and Reference" by Gottlob Frege,On Denoting" by Bertrand Russell,Naming and Necessity" by Saul Kripke,A Theory of Descriptions" by Bertrand Russell,The Problem of the Essential Indexical" by John Perry,The Nature of Truth" by Michael Dummett</documents_info>