Philolaus wrote a book on the Pythagorean doctrines. By him were first given to the world the teachings of the Italian school, which had been kept secret for a whole century.
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There is every reason to believe that the later Pythagoreans exercised a strong influence on the study and development of mathematics at Athens . The Sophists acquired geometry from Pythagorean sources. Plato bought the works of Philolaus and had a warm friend in Archytas.
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