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Hidden Harmonies is written by Ellen Kaplan and published by Bloomsbury Publishing USA. It's available with International Standard Book Number or ISBN identification 1596915226 (ISBN 10) and 9781596915220 (ISBN 13).
The Harvard mathematician authors of The Art of the Infinite present a history of the famous relation "A squared plus B squared equals C squared" that assesses its contributors from da Vinci to the Freemasons while analyzing its numerous proofs and applications.