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Updated: May 19, 2025
On March 15, 1861, a facsimilist, Betbeder, issued a challenge, undertaking to execute autographs that it would be impossible to detect, by paper, ink, handwriting, or text. The trial came off in the presence of experts, and in April 1864 they pronounced that his imitations could not be distinguished from originals. In those days there was a famous mathematician whose name was Chasles.
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