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Ernst Cassirer (1923) Substance and function and Einstein's theory of relativity, Chicago, Open Court.
Structuralism
The concept of thing and the concept of relation
Ernst Cassirer
pp. 3-236
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(1910) "Dingbegriffe und Relationsbegriffe", in: Cassirer Ernst, Substanzbegriff und Funktionsbegriff, Berlin, Bruno Cassirer, pp.3-312.