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What subject did Rudolf Carnap address in his 1921 doctoral dissertation?

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In his 1921 doctoral dissertation at the University of Jena, Rudolf Carnap addressed the concept of space.1

He argued that the existing scholarly conflicts regarding theories of space stemmed from the fact that these theories were actually addressing three distinct subjects: formal space, physical space, and intuitive space. His work focused on exhibiting the fundamental characteristics and differences of these three concepts.1