Euclid — "Proof by contradiction is a powerful tool."
Proof by contradiction is a powerful tool.
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"A circle is a plane figure contained by one line such that all the straight lines falling upon it from one point among those lying within the figure are equal to one another."
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Details
While Euclid extensively used proof by contradiction (reductio ad absurdum) throughout 'Elements', this specific phrasing is a modern summary of his method, not a direct quote.
Date: c. 300 BCE (implied by method)
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