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3. Frege, G., Grundlagen der Arithmetik, Breslau, Wilhelm Koebner, 1884; transl. J.L. Austin, The Foundations of Arithmetic: A logico-mathematical enquiry into the concept of number, Oxford, Blackwell, 1953.
4. Galileo, Dialogo sopra i Due Massimi Sistemi del Mondo, Florence, Giovanni Batista Landini, 1632; transl. S. Drake, Dialogue Concerning the Two Chief World Systems, Berkeley, University of California Press, 1967.
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