“Frege's pair of concepts (nominatum and sense) is compared with our pair (extension and intension). The two pairs coincide in ordinary (extensional) contexts, but not in oblique (nonextensional) contexts.”

—  Rudolf Carnap

Source: Meaning And Necessity (1947), p. 124 as cited in: E. Cornell Way (1991) Knowledge Representation and Metaphor. p. 183

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Rudolf Carnap 21
German philosopher 1891–1970

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