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Barry Mazur published an article some year ago, where he showed, among otherthings, that the result in the so-called mathematical passage of Plato sTheatetus and Euclid s proposition X.9 in the Elements are very different,while almost all historians and commentators have claimed the opposite. In thislecture, we consider this question to try to understand how and why could havehappened such an error, this 'strange delusion' to quote Mazur.

Barry Mazur against Papps -- 15 centuries of error on a Euclid's proposition